Hibanobambusa kamitegensis (Poaceae-Bambusoideae), a New Species from Fukui Prefecture, Honshu, Japan

2012·1.3 MB·English

by  Mikio Kobayashi

J. Jpn. Bot. 87: 229–235 (2012)
Hibanobambusa kamitegensis (Poaceae: Bambusoideae),
a New Species from Fukui Prefecture, Honshu, Japan
Mikio kobayashia, * and Takao wakasugib
aDepartment of Forest Science, Faculty of Agriculture, Utsunomiya University,
350, Mine, Utsunomiya, 321-8505 JAPAN;
bFukui Botanical Garden, 17-3-1, Asahi, Echizen-cho, Fukui, 916-0146 JAPAN
*Corresponding author: [email protected]
(Accepted on March 29, 2012)
A new species of Hibanobambusa (Poaceae: Bambusoideae), H. kamitegensis M.
Kobay. & Wakasugi is described from Fukui Pref., Honshu, Japan. H. kamitegensis is
distinguished from H. tranquillans (Koidz.) Maruy. & H. Okamura in having glabrous
prophylla borne on mid-culm node, culm-sheaths slightly pubescent with retrorse minute
hairs and scattered spreading long hairs, slanted upper margin of foliage leaf-sheaths with
sickle-shaped auricles, leaf surface pubescent with scattered deciduous long hairs, and
slightly shorter and wider leaf-blades with longer petioles.
Key words: Bambusoideae, Fukui Prefecture, Hibanobambusa kamitegensis, Japan, new
species.
The genus Hibanobambusa was described m. The stand was surrounded with scattered
by Maruyama et al. (1979) based on its type, H. vegetation including Cryptomeria japonica,
tranquillans (Koidz.) Maruy. & H. Okamura Castanea crenata, Paulownia tomentosa,
as a putative intergeneric hybrid between Armeniaca mume, Phyllostachys bambusoides
Phyllostachys and Sasa. Its distribution range and others. The specimens of the bamboo were
was restricted to only four localities, i.e., Mt. precisely studied with vegetative organs in
Hiba-yama (the type locality of Semiarundinaria comparison with the specimens of H. tranquillans
tranquillans Koidz.), Shimane Prefecture, from the type locality (M. Kobayashi & Y.
Shôbara, Hiroshima Prefecture (Hirose 1986), Sugimura 161-1–5, FUK 15046–15050) and some
Takahashi, Okayama Prefecture (Katayama clumps cultivated at the Fuji Bamboo Garden,
2007), and Fukui, Fukui Prefecture (Kobayashi Shizuoka Prefecture, originally introduced from
2001, 2011). During an inventory for the "Flora of the type locality (H. Kashiwagi, 23 Dec. 2010,
Fukui Prefecture" (2003), one of us (TW) found TNS-VS-1140662–1140666). After comparing the
a clump of unknown bamboo that apparently specimens from Kamitega with H. tranquillans in
has an affinity with H. tranquillans, at Kamitega, detail, we concluded that the plants represent an
Fukui, Fukui Prefecture in 2000. A small clump undescribed species of Hibanobambusa. Here we
of the plant about 4×5 m-wide was located in describe H. kamitegensis as a distinct, new species
the vicinity of an old shrine at an altitude of 150 endemic to Fukui, Fukui Prefecture, Japan.
—229—
230 植物研究雑誌　第87巻　第4号 2012年8月
Fig. 1. Holotype of Hibanobambusa kamitegtensis M. Kobay. & Wakasugi (T. Wakasugi 6081–10,
FUK 15010) from Fukui Prefecture, Japan.
August 2012 Journal of Japanese Botany Vol. 87 No.4 231
Fig. 2. Hibanobambusa kamitegensis. A. Culm with a sympodial rhizome in the amphipodial system. B.
Young shoot with reflected sheath-blades. C. Auriculated oral setae. D. Prophyll at a mid-culm node.
Scale: 10 cm (A, B), 1 cm (C, D).
232 植物研究雑誌　第87巻　第4号 2012年8月
Taxonomic treatment Wakasugi 20505 (FUK 15035–15045); loc. cit., 24 June 2000,
M. Kobayashi 1672 (TNS 1140667–1140668).
Hibanobambusa kamitegensis M. Kobay. &
The plant has an amphipodial rhizome system
Wakasugi, sp. nov. [Figs. 1–4]
combining with monopodial and sympodial
Type: JAPAN. Honshu: Fukui Pref., Fukui-
rhizomes (Fig. 2) suggesting that one of the
shi, Kamitega, 8 June 2000, T. Wakasugi 6081-
parental taxa belongs to the Sasa group. The plant
10/11 (FUK 15010–holotype, Fig. 1; T. Wakasugi
has monocladal, i.e., one-branch per node, branch
6081-1–9/11, 11/11, FUK 15000–15009–isotypes).
complement of several wide ellipsoidal, lanceolate
Rhizome amphipodial–mainly monopodial
leaf-blades on the top of the twig with long
and partly sympodial. Culm 1 cm in diameter,
brushy oral setae born on each culm node, the
3–4 m in height, erect or slightly procumbent at
culm-sheaths partially persistent at distal nodes
base, hollow, slightly sulcate with monocladal
on each branch complement, while deciduous on
branching. Prophylla borne on mid-culm glabrous,
the mid-culm (Figs. 1, 3), showing that the species
margin minutely ciliate. Culm-sheaths deciduous,
is a member of the genus Hibanobambusa, thus,
slightly pubescent with retrorse, minute hairs and
diagnostic morphological features of the genus
scattered, spreading long hairs, or persistent on the
Sasa on one hand, appear with characters of the
distal internodes of branch complements. Foliage
genus Phyllostachys on the other hand. Sheath-
leaf-sheaths pubescent with scattered, deciduous,
blade on the mid culm nodes of young shoot
long hairs, upper margin slanted, with sickle-
reflect (Fig. 2) suggesting that one parental species
shaped auricles, ligule 1.5 mm long, truncate. Oral
of Phyllostachys belongs to sect. Phyllostachys
setae brushy, ca. 10 mm long. Foliage leaf blades
(Renvoize and Hodkinson 1997).
tesselated, ovate-lanceolate, acuminate, 172–274
The specimen has several distinct
mm long, 40–70 mm wide, abaxially pilose along
morphological features as shown in Table 1.
the midribs and/or veins only at base. Petioles
Prophylla embracing buds borne on mid-culm
8–15 mm long. Flowers unknown.
are glabrous and its margin has minute ciliate
Japanese name: Echizen-Inʼyô (nom. nov.).
hairs (Fig. 2D), while H. tranquillans is pubescent
新和名：エチゼンインヨウ
with dark brownish short hairs on the upper
Additional specimens examined: JAPAN. Honshu,
half surface and the margin is ciliated. Culm-
Fukui Pref., Fukui-shi, Kamitega, 8 June 2000, T. Wakasugi
6082–6085 (FUK15011–15034); loc. cit., 5 May 2002, T. sheaths are slightly pubescent with retrose minute
Table 1. Comparison of diagnostic morphological features between Hibanobambusa kamitegensis and H.
tranquillans
H. kamitegensis H. tranquillans
pubescent with short, dark brown hairs
Prophyll on the mid-culm bud glabrous, margin minutely cilliate
in upper half, margin cilliate
pubescent with retrorse, minute hairs pubescent with a mixture of spreading
Culm-sheath
and scattered, spreading hairs hairs and retrorse, long hairs
pubescent with deciduous, scattered,
Leaf-sheath glabrous
long hairs
Upper margin of leaf-sheath slanted horizontal
Auricle sickle-shaped ellipsoidal
Ligule truncate obtuse
pubescent with short hairs along the
Abaxial surface of leaves glabrous
midrib and veins at base
Petiole length (mm) 10.1 ± 1.8 (max: 15) 9.4 ± 2 (max:13)
Leaf blade length (mm) 243.2 ± 12.7 (max: 274) 263.2 ± 30.9 (max: 308)
Leaf blade width (mm) 52.9 ± 6.0 (max: 70) 51.0 ± 7.0 (max: 62)
August 2012 Journal of Japanese Botany Vol. 87 No.4 233
Fig. 3. Hibanobambusa kamitegensis. Culm and branch complements. Scale: 10 cm.
234 植物研究雑誌　第87巻　第4号 2012年8月
new species of Hibanobambusa, H. kamitegensis
after the type locality in Fukui, Fukui Prefecture.
In which the Japanese name, Echizen-inyo; i.e.,
“Echizen” means the ancient name of the Fukui
area.
We are indebted to Mr. Harutsugu Kashiwagi,
the Fuji Bamboo Garden for providing us
a cultivated specimen of Hibanobambusa
tranquillans. We also thank Mr. Kazuhiro
Miki for providing us a scarce reference on the
distribution of H. tranquillans in Hiroshima
Prefecture.
References
Hirose S. 1986. A note on Inyochiiku, Hibanobambusa sp.,
Fig. 4. Hibanobambusa kamitegensis. Juncture of foliage Bambusaceae from Shobara, Hiroshima Prefecture.
leaf-sheath and blade. Scale: 1 cm. Hibakagaku 13: 1–6 (in Japanese).
Maruyama I., Okamura H. and Murata G. 1979. On a new
hybrid genus Hibanobambusa. Acta Phytotax. Geobot.
30(4–6): 148–152 (in Japanese).
hairs and scattered spreading long hairs, while
Katayama H. 2007. Hibanobambusa tranquillans (Koidz.)
H. tranquillans is mixed with spreading and Maruy. & H.Okamura was found at Kawakamicho and
retrose long hairs. Leaf-sheath in the specimen another newpoint, Kosecho. Both are in Takahashi-City,
are scattered with deciduous long hairs, whereas Okayama Pref., The Reports of the Fuji Bamboo Garden
51: 27–30 (in Japanese).
glabrous in H. tranquilans As shown in Fig.4,
Kobayashi M. 2001. Bambuseae. Flora of Fukui Prefecture;
upper margin of foliage leaf-sheaths were slanted,
Bryophytes, Lichens & Supplement. pp. 185–214. Fukui
with sickle-shaped auricle, truncate ligule, and Prefecture, Fukui (in Japanese).
pubescent only at the leaf-base alongside the rib or Kobayashi M. 2011. Graminae: Bambusoideae. In: Kato
M. and Ebihara A. (eds.), Endemic Plants of Japan. pp.
veins, while in H. tranquillans, the upper-margin
169–176. Tokai University Press, Hadano (in Japanese).
horizontal, with ellipsoidal auricle, obtuse ligule,
Renvoize S. A. and Hodkinson T. R. 1997. Classification of
and glabrous at the blade-base. When comparing Phyllostachys. In: Chapman G. P. (ed), The Bamboos.
foliage leaf blade length among the leaves longer pp. 96–106. Academic Press, London.
than 20 cm, foliage leaf-blade of the specimens Wakasugi T. 2003. Noteworthy plants of Fukui Prefecture,
with special reference to phytogeographic relationship to
were a little bit shorter and wider with longer
flora of Atetsu area – As a consideration for the Flora of
petioles than those of H. tranquillans (Table 1).
Fukui Prefecture–. J. Phytogeogr. & Taxon. 51: 103–112
These features made us classify this specimen as a (in Japanese).
小林幹夫a，若杉孝生b：福井市で発見されたインヨウ
チク属の１新種エチゼンインヨウ（イネ科：タケ亜科）
　インヨウチクは基準産地の島根県比婆山，及び広島県 い芽溝が発達する．稈鞘は枝を残して脱落する．葉は広
庄原市，岡山県高梁市，福井県福井市のみに知られる， 楕円状披針形で，肩毛はブラシ状である．
マダケ属とササ属を両親種とする推定属間雑種である． 　2000年に福井県福井市上天下（旧丹生郡清水町）か
稈は直立もしくは斜上し，単軸型地下茎を主とした両軸 ら得られた標本について，花はまだ知られていないの
型地下茎を発達させ，1節より1本の枝を出し，幅の狭 で，栄養器官の標本と，基準産地由来のインヨウチ
August 2012 Journal of Japanese Botany Vol. 87 No.4 235
クの標本を詳細に形態比較した結果，未記載の新種 出する長毛が出る（開出および逆向する長毛を密生す
という結論に達したので，エチゼンインヨウ（新称） る）．葉鞘には脱落性の開出長毛が出る（無毛）．葉鞘の
Hibanobambusa kamitegensis M. Kobay. & Wakasugi 上縁は強く斜上し（水平），中位にある盤状体，すなわ
として報告した．種形容語は基準産地の上天下（かみて ち葉耳は鎌形（楕円形）である．葉下面は無毛であるが，
が）に因む． 葉脚部にのみ，中肋や側脈に沿って短毛がある（無毛）．
　エチゼンインヨウは次のような形態的特徴を有して 葉身の長さ20 cm以上の葉を比較した結果，葉柄はイ
いる（インヨウチクに見られる形質を括弧中に示す）． ンヨウチクに比べやや長く，葉身は短く幅が広い．
稈中部の芽を抱く前出葉は無毛で上縁には細かい毛が （ a宇都宮大学農学部森林科学科，
生える（上半分が黒褐色の短毛で覆われ，縁には繊毛状 b福井総合植物園）
の毛）．稈鞘にはうっすらと逆向短毛が生え，疎らに開