ANew Species of Canna (Cannaceae) from Northern Argentina

3 Pages·2000·0.24 MB·English

by  Nobuyuki Tanaka

・円，，YEM4ム京詣巴・咽3YEd--品川ィ，知PE研円出品内九肱引雑凡〈誌別nu 、‘.，，
A New Species of Canna (Cannaceae) from Northern Argentina
a b
Nobuyuki TANAKAand Tetsuo KOYAMA
aMakino Herbarium，G raduate School of Science，T okyo Metropolitan University，
Minamiosawa 1-1，Ha tiouji city，T okyo，1 920397JAPAN;
・
bNihon University College Museum of Bioresource Sciences，1 866 Kameino，F ujisawa，K anagawa，2 52-0813 JAPAN
(Received on May 31，1 999)
Canna plurituberosa T.Koyama & Nb.Tanaka from northern Argentina is de-
=
scribed here with ad etailed illustration. Chromosome number of 2n 18 was also
reported.
Key words: Canna plurituberosa，n ew species，Ar gentina
In 1984，d uring the course of his field rhizomate cormis parvulis multis dense
expedition to Argentinian-Bolivian frontier， aggregatis constructo，n on repente neque
Tetsuo Koyama collected af ew plants of a
Canna species，w hich he thought to be
something hitherto undescribed because of
their peculiar rhizomes consisting of
densely agglomerated tuberose units. How-
ever，t he plants were all sterile. Recently
these Canna plants cultivated in the gardens
of the Makino Herbarium and Nihon Uni-
versity brought flowers.
Somatic chromosomes were observed
with root tip cells. The root tips were pre-
treated with 2m M8 -hydroxyquinoline for
three hours at room temperature before they
were fixed in 1:3 acetic alcohol at 50C for
24 hrs. Then they were macerated with 1:2
mixture of 1N HCl and 45% acetic acid at
600C for 30 seconds. After stained with 1%
aceto-orcein for at room temperature，th ey
were squashed. As ar esult the diploid chro-
mosome number of 2n = 18 (x = 9) was
determined for C. plurituberosα.
Canna plurituberosa T. Koyama &
Nb.Tanaka，sp . nov. (Fig. 2) ev icinia C. in-
Fig. 1. Rhizome morphology of Canna plurituberosa
dicae，a b ea tamen distincte recedit
(A) and C. india L. (B)
-89ー
90 植物研究雑誌第75巻第2号 平成12年4月
stolonifero，e t bracteis f10rum multo abbreviatum cormis multis globosis
grandioribus. subovoideisve 4-5 cm longis albescentibus
Plantae 1.5-2.0 m altae. Rhizoma apice purpureo-tinctis constructum，S lne
本
、
い
f
に
山 l
ム 1
E
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A
川
m 四 E 川回MG kmH
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U

i咽pHm

l
1~・::，..'!~V...・:::、司 J
5cm
5cm A ~ん~
Fig. 2. Canna plurituberosa. A，s hiozome; B，le af and part of stem; C，in f1orescence; D，f1 ower; E，
f1oriferous bract; F，se pal; G，st yle; H，s tamen with ao ne-celled anthher to its margin; 1，ca psule
on stem; J，s eed.
Apri12000 Journal of Japanese Botany Vo .l75 No. 2 91
internodiis elongatis，n on stoloniferum nec de Reyes，2 0 kmN Wof Jujuy，1 750 m al ，.t
repens. Folia ovatoelliptica，40-65 cm only af ew plants noted on wooded steep
司
longa，1 5-30 cm lata，l aete viridia，a pice slope of ag orge. T. Koyama 15858，c ulti-
acuta acuminatave，ba si in vaginam gradatim vated in the garden of the Makino Her-
attenuantes. Inf10rescentia unica，t erminalis， barium，T okyo Metropolitan University
ut videtur subspiciformis (revera racemosa)， (MAK-holotypus; TNS-isotypus). Do.，cu l
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non ramosa，1 0-15 cm longa. Flores binati， tivated in the garden of Nihon University，
pedunculis brevibus 2-4 mml ongis，br acteis College of Bioresource Sciences
grandibus late obdeltoideo-obovatis，2. 5 cm (Paratypus-TI).
longis，1 .5-2.0 cm latis，c irereo-virentibus; Distribution: Thus far known only from
sepala 3，a lbo-virentia，o blongo-lanceolata， the type locality.
1.5-2.0 cm longa; petala 3，l anceolata，4 .5- Canna plurituberosa resembles C. indica
5c m longa，f1 avo-albescentia; staminodia 2， in general characters. However，t he rhi-
linearioblanceolata，7.0-7.5 cm longa，1 .0- zomes are consisting of al arge dense clus-
国
1.3 cm lata，a pice dentata vel obtusa ters of small tubers (Fig. 1A)which is quite
・
interdum mucronata; labelllum recurvum， different from horizontally elongated and
aurantiacum，b asi flavescens，a pice stoloniferous ones in C. indica. This type of
incisulatum; stamen petaloideum aurantiaco- rhizomes found in C. plurituberosa has not
rubrum，s taminodia subaequans，a nthera been reported in the related species of
marginale 1.2c m longa 1-cellulare; stylus Canna. In addition，b racts are broadly
aurantiacus，li nearis，6. 5 cm longus. Capsu obdeltoid-obovate and much larger (2.5 x
目
lae globosae，p arvulae，1 .5-2 cm longae， 2.0 cm in size) in the present species，
apice stylobasi persistente mucronatae; whereas they are ovate to oval and smaller
semina 1-5，g lobulosa，g randula，c a. 1c m (1.0x 1 .5c m in size) in C. indica. Further-
diam.， maturitate nigrescentia. more，in this new species the staminodes are
Chromosomata: 2n = 18. as long as the functional stamen whereas
Typus: ARGENTINA: Prov. J吋uy，tribu they are clearly exceed it in C. indica.
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tary of Alto Rio Grande，C amino aT ermes
田中伸幸a，小山銭夫b.アルゼンチン北部からのカ
ンナ科の一新種
著者の一人小山は 1984年にアルゼンチン北部 ものは他のカンナ科の植物では知られていない.
の植物調査を行った際，フフイ州の山地の斜面で さらに花序は若葉から花茎が伸長せず，分校もし
カンナ属の一種を採集した.その採集品を東京都 ない.花部の直葉は長さ 2.5cmに達して大型で，
立大学牧野標本館園場と日本大学生物資源科学部 一つの彊葉に2-3花，穫色で長さ約 8cmの比較的
実験温室にて栽培調査を続けたところ，特異な根 大きい花をつけ，果実は非常に小さい.一つの果実
茎を有するカンナ科の一新種であることが判明し には仁 indicαでは通常 15-20個の種子を有するが
たので，その形態から Cannaplurituberosa 本種は直径1cmの大型の種子を 1荷果中に 1-5個
T.Koyama & Nb.Tanakaと命名・記載した.本種は しかcもたない.染色体数は 2n=1 8であった.
節聞が他種のように伸長せず，球形の塊茎が多数 東京都立大学大学院理学研究科牧野標本館
集まって構成されるカンナ科では特異な形態、の根 b日本大学生物資源科学部資料館)
茎をもち，株は叢生する.本種のような根茎をもっ