Notes on East Himalayan Species of Impatiens (1)

7 Pages·1992·0.49 MB·English

by  Shinobu Akiyama

植物研究雑誌
J. Jpn. Bot.
67: 187-193 (1992)
Originals
No tes on East Himalayan Species of Impatiens (1)
Shinobu AKIYAMAa，H ideaki OHBAba nd Mitsuo SUZUKIC
aBotanical Gardens，Fa culty of Science，Un iversity of Tokyo，
3-71Hakusan，B unkyoku，Tokyo 112 JAPAN;
・ ・
bDepartment of Botany，Un iversity Museum，Un iversity of Tokyo，
7-3-1 Hongo，T okyo 113 JAPAN;
CDepartment of Biology，Co llege of Liberal Arts，K anazawa University，K anazawa 920 JAPAN
東部ヒマラヤ産ツリフネソウ属新知見 (1)
秋山忍a，大場秀章b，鈴木三男c
a東京大学理学部附属植物園 112東京都文京区白山 3-7-1
b東京大学総合研究資料館生物系研究室 113東京都文京区本郷 7-3-1
c金沢大学教養部生物 920金沢市丸の内 1-1
(Received on November 2，1 991)
Two new species of Impatiens are described based on recent collections from eastern Himalaya;
よmallaeS. Akiyama et al. from east Nepal and 1. griersonii S. Akiyama et al. from west Bhutan. New
localities of I. sunkoshiensis S. Akiyama et a1. and I. discolor DC. are reported. Variation of the shape
of lower sepals in 1. scabrida DC. is discussed.
Akiyama，O hba and Wakabayashi (1991) recto vel deorsum leviter curvato congeneribus
published ar evisional note of sixteen species of diversa. A Impatienti stenantha Hook.f.，よ
Impatiens found in central and east Nepal with two drepanophrαHook.f. et speciebus aggregatis
new species. The present note aims to describe two floribus roseis nec luteis，c alcaribus rectis vel
new species of Impatiens found in east Nepal and deorsum curvatis et foliis lineari-ellipticis bene
west Bhutan，a nd report on the extention of differt.
distribution range of two species. This also pro- Typus: EN epal. Koshi Zone，S ankhuwa Sabha
vides some new data of the lower sepal of Im- Distr.， Khongma (Kauma) - Tashi Gaun
patiens scabrida DC. for discussion about the (Tashigaon)，2 160-3500 m in alt. Suzuki et al.
variation. The measurement of flower parts and no. 8821106 (TI-holotype; KATH-isotype).
terminology are those of Akiyama et al. (1991). Plants 20-30 cm tall. Leaves alternate，n ot
1) Impatiens mallae SA kiyama，H Ohba et M conspicuously aggregated at apical part of
Suzuki，sp . nov. [Figs. 1a nd 2a-g] stem，w ith petioles (almost sessile-)1-2 mml ong，
Floribus gracilibus roseis， infimis sepalis lamina linear-elliptic，5 -7 cm long，0 .5-0.8 cm
gracilibus tubularibus inferne verrucosculis，ca lcari wide，a pex round usually with al ittle point less
一一187-
188 植物研究雑誌第67巻第4号 平成4年8月
Fig. 1. Impatiens mallae (Type).
than 1m ml ong，b ase attenuate，m argin crenate Peduncles 1.2-1.5 cm long. Pedicels nearly
(with al ittle point less than 1m ml ong at each glabrous，ca . 1c m long，wi th ab ract at base. Bract
sinus)，g labrous on both surfaces. narrowly ovate or lanceolate，ap ex slightly awned，
Inflorescences racemes，b orne from the upper ca. 1m ml ong.
leaves，1 .5-2.5 cm long，w ith 1-3 flowers. Flowers 3-3.5 cm deep. Lateral sepals 4( 2
August 1992 Journal of Japanese Botany Vol. 67 No. 4 189
予
e
，A
Fig. 2. Impatiens mallae (a-g: Suzuki et al. no. 882110の，よgriersonii(h-m: Suzuki et al. no. 91211 10)
andよsunkoshiensis(n-r: Suzuki et al. no. 912110の.aa nd h: Flower. b，c， i. j，n a nd 0: Dorsal petal.
d，k a nd p: Lateral united petals. e，1a nd q: Lower sepal. f: Lower lateral sepal. g: Upper lateral sepal.
m and r: Lateral sepal. ax 1.5，b -g and n-r x3，h -m x6.
pairs); lower pair large，o vate，2 .5-3 mml ong， ca. 8m ml ong，ca . 5m mw ide; lower lobe 18-20
2-2.5 mmw ide; upper pair minute，m em- mml ong，ca . 4m mw ide，li near-elliptic. Anthers
branaceous，ca . 1m ml ong. Lower sepal pink， without appendage.
10-12 mml ong，1 2-15 mmd eep (including Other specimens examined. E Nepal. Koshi
spur) ，n avicular，t apering into spur，l ower Zone，S ankhuwa Sabha Dist ，.rKhongma (Kauma)
side warty. Dorsal petal pink，c a. 8m ml ong， -Tashi Gaun (Tashigaon)，2 160-3500 m in alt.
ca. 8m mw ide，wh en flattened，cu culate，wi thout Suzuki et al. no. 8850757 (TI); Bhainsi Kharka -
crest-like appendage，a pex acute. Lateral united Khongma (Kauma)，2 540-3500 m in alt. Suzuki
petals pink，2 3-28 mml ong; upper lobe ovate， et al. no. 8850391 (TI).
190 植物研究雑誌第67巻第4号 平成4年8月
Impatiens mallae is well characterized by the Pedicels nearly glabrous，ca . 1c m long.
pinkish long and narrow flowers and the slender Flowers white，8 -10 mml ong，8 -12 mmd eep.
tubular lower sepals with as traight or slightly Lateral sepals 2，ca . 1m mlo ng，ov ate. Lower sepal
downturn spur as well as the warty lower surface. white，na vicular，ta pering into ac urved spur，4- 5
This species is somewhat similar to the species of mml ong，1 0-12 mmd eep inc1uding spur.
the aggregate comprising 1. stenantha Hook.f.，1. Dorsal petal white，2 -3 mml ong，3 -4 mmw ide，
drepanophora Hook.f. and others characterizing when flattened，c uculate，w ithout a crestlike
嗣
by the combination of basically yellow flowers， appendage. Lateral united petals white，8- 9 mm
upturned spurs and slender twisted lips. From them long; upper lobe ovate，ca . 3m ml ong，ca . 1.5
1. mallae greatly differs by having pinkish flowers， mm wide; lower lobe narrowly obovate or
straight or downturn spurs and linear-elliptic triangular-obovate，no t bilobulate，ca . 6m mlo ng，
leaves. ca. 2.5 mmw ide. Anthers without appendage.
Impatiens mallae has collected from two Impatiens rαcemosa and its closely related
，
localities in the Arun valley area (Suzuki 1988)， species，c ommonly having racemose inflorescences
where it grows along at rail in ad amp evergreen and yellow flowers with boatshapedlower sepals
帽
broad-leaved forest comprising the species of tapering into al ong downturn spur，ar e distributed
Castanopsis. It seems to be not ap articularly in the area involving Nepal，S ikkim，B hutan，S
curious or showy but ar ather common species only Tibet，S W China，a nd specifically and geo
・
escaped from botanical eyes. graphically separated from one another by the
We dedicated the epithet in honour of Dr. one or few differences in the size and shape of
Samar B. Malla，fo rmer director of Department lateral united petals. Impatiens griersonii is similar
of Forestry and Plant Research，K athmandu，fo r to the species in this aggregate but fundamentally
his collaboration on the floristic studies in Nepal. different with essentially whitish flowers and lateral
2) Impatiens griersonii SA kiyama，H Ohba et united petals with a narrowly obovate or
M Suzuki，sp . nov. [Fig. 2h-m] triangular-obovate and never bilobed lower lobe.
Species ad simi1isI mpatientis racemosαeDC.， This species grows along at rail in shady forest，
sed aq ua et lobis distalibus petalorum unitorum and the habitat is well separated from that ofよ
lateralium angusti triangularive obovatis nec racemosa restricted in rather sunny place.
bilobis et floribus albis statim dignoscenda. Wen amed this species in honour of late Dr. A
Typus: Bhutan. Thimphu Dist ，.r Barshong - J C Grierson (1929-1991)，R oyal Botanic
Dodena，2 480-3500 m in alt. Suzuki et al. no. Garden，E dinburgh， for his contribution to
9121110 (TI). Bhutanese flora.
Plants 30-50 cm tall. Leaves alternate， 3) Impatiens sunkoshiensis SA kiyama，H Ohba
somewhat aggregated at apical part of stem， et Wakabayashi in Ohba and Malla，H im. Pl. 2:
with petioles 0.8-1 cm long，l amina lanceolate， 77 (1991). [Fig. 2n-r]
ca. 6c m long，ca . 2.5 cm wide，a pex acute，ba se An additional specimen examined. Bhutan.
attenuate，ma rgin crenate，ne arly glabrous on both Thimphu Distr.，Ba rshong -Dodena，24 80-3530
surfaces. m in alt. Suzuki et al. no. 9121104 (TI).
Inflorescences racemes，3 -5 cm long，ax illary， Impatiens sunkoshiensis was described by the
with 4-8 flowers. Pedunc1es 1.5-2 cm long. specimens from between Sete and Taktor with
August 1992 Journal of Japanese Botany Vol. 67 No. 4 191
elevation of 2550-3200 m，S olukhumbu District， the species makes small colony along at rail in
east Nepal and also collected from several places shady forest.
in the same District and Rolwaling Khola，ce ntral The Bhutan plant exactly agrees with those of
Nepal. Nepal (Fig. ln-r). The species extends the
The species is similar to 1. graciliflorαHook.f. distribution range to Bhutan interruptedly. So far
and 1. radiata Hook. ，.fbut differs from the former it has not been found in the east of Arun valley
by the short，fe w-flowered (not radiated) racemes in Nepal nor in Sikkim where it might reasonably
as well as the lower sepals with ac onspicuous， be expected to occur.
straight spur shorter than the length of lower sepal， 4) Impatiens discolor DC.，P rodr. 1: 687 (1824);
and from the latter by the large lateral united petals Akiyama et al. in Him. Pl. 2: 81 (1991).
with obtriangular or narrowly obovate to semi- [Fig. 3a-e]
orbicular lower lobe around 6m mw ide and also An additional specimen examined. Bhutan.
the racemose inflorescences. Thimphu Distr.， Dolau Kench - Dodena，
The first and third authors have col1ected this 2480-3280 m in alt. Suzuki et a1. no. 9121111
near Barshong (alt. ca. 3400 m) in Bhutan，w here (TI).
Fig. 3. Impatiens discolor (a-e: Suzuki et al. no. 9121J 11) andよscabridlα(f-j:Suzuki et a .lno.
9121005). a，b ，f a nd g: Dorsal petal. ca nd h: Lateral united petals. da nd :iLower sepa1. ea nd j:
Lateral sepal. All x2. 5.
192 植物研究雑誌 第67巻 第4号 平成4年8月
Impatiens discolor is well characterized by the (
同
日
lateral united petals with ad olabriform lower lobe， )
z
the cuspidate anthers，sa ccately bucciniform lower u∞ロ -×
ω -
sepals white or pale yellow with deep orangish 凶
×
15 × •
stripes as well as the helmet-shaped dorsal petals ・.・ •
with ac onspicuous crest. In east Nepal the authors
×

have seen many times in many places to grow × •
sporadically on shady soil-rich trail-side banks in
10
subalpine Rhododendron arboreum-forests. •
The first and third authors have found this OL吋。 15 20 Depth (mm)
between Dolau Kench and Dodena in Bhutan，
Fig. 4. Variation in size of the lower sepal of Impαtiens
where it grows by at rail in shady forest. The scabrida .: Nepal. x: Bhutan.
significant floral features exactly agree with those
from Nepal and Sikkim. The range of the species Impatiens scabrida，ev en having funnel-shaped
extends from west Nepal to Bhutan through central lower sepals，is easily distinguished from I.
and east Nepal and Sikkim. urticifoUαby the crested dorsal petal and the ovate
5) Impatiens scabrida DC.，P rodr. 1: 687 lower lobe of the lateral united petals with obtuse
(1824); Akiyama et al. in Him. Pl. 2: 83 (1991). apex as well as the bract located in the middle
[Fig. 3f-j] portion of the pedicel.
This species often has flowers with asymmetri- Additional specimens examined and measured
cally arranged lateral united petals when viewed (others were cited in Akiyama et al. 1991). C
from the front. The lower sepals is bucciniform Nepal. Godawari (Godavari)，15 00 m in alt. Hara
but the ratio of the length and the depth shows a et al. no. 6306731 (TI); Hara et al. no. 69870 (TI);
wide range of variation. In central and east Nepal Kanai no. 674472 (TI). Takumsibang，55 00 ft. in
the depth is usually longer than the length; so that alt. Stainton et al. no. 4247 (TI). Dhanche，18 00 m
the shape of the lower sepals seems to be rather in alt. Shakya & Adhikari no. 611 (TI). Bhutan.
tubular. However，in this species some flowers Paro Dist ，.r Druk-Gyel Dzong -Gunitshawa，
have funnel-shaped lower sepals in which the 2440-2700 m in alt. Suzuki et al. no. 9121005
length is longer than the depth，a nd the shape (TI). Rinchu -Mishichen，1 300-1400 m in alt.
becomes similar to that ofよ urticifoliaWall. In Hara et al. no. 14050 (TI). Chima Khoti -
1. scabrida the latter shape seems to be rare in Phuntsholing，90 0-2150 m in alt. Hara et al. no.
Nepal as far as observed. 131 (TI). Mishichen -Khosa，1 400-1600 m in
Fig. 4s hows the ratio of the length and the alt. Hara et al. no. 13534 (TI). Khosa -Tamji，
depth of the lower sepals. It suggests that the 1800-2200 m in alt. Kanai et al. no. 13203 (TI).
difference is not fundamental，a nd continuous
through intermediate forms between tubular and This study was supported by the Grants-in-Aid
funnel-shaped. Both tubular and funnel-shaped for Overseas Scientific Research No. 63041060 in
lower sepals are found in Nepal and Bhutan，an d 1988 (to M S) and No. 03041035 in 1990 (to M S)
no geographical tendency in the variation can be from the Ministry of Education，S ciences and
found. Culture，J ap an.
August 1992 Journal of Japanese Botany Vol. 67 No. 4 193
References 要 旨
Akiyama S.，O hba H. and Wakabayashi M. 1991. Taxo-
nomic notes of the east Himalayan species of Impatiens. 最近の東部ヒヤラヤ地域の調査で採集された標
Studies of Himalayan Impatiens (Balsaminaceae) (1).
ln: Ohba H. and S. B. Malla (ed.)，Hi malayan Plants 本を調べたところ， 2新種が見いだされたので
2: 67-94，c olour pls. 4-8. Univ. of Tokyo Press， Impαtiens mαllae，1. griersoniiと命名し記載し
Tokyo.
た.
Suzuki ~. 1988. Japan判epalCooperative Botanical
Expedition in 1988. Newsletter of Himalayan Botany また，Impαtiens.sunkoshiensisとよ discolor
No. 4，6 -14. はブータンにも産することが判り，従来知られて
いた分布域が広がった.Impαtiensscαbridαは下
尊片(唇弁)の形にかなり幅の広い変異がみられ
るので，標本にもとづいて計測し，その変異が連
続的なものであることを明らかにした.