Table Of Content392 植物研究雑誌 第87巻 第6号 2012年12月
J. Jpn. Bot. 87: 392–394 (2012)
Hiroyoshi OHASHIa, * and Kazuaki OHASHIb: A New Combination in
Monarthrocarpus (Leguminosae: Tribe Desmodieae)
aHerbarium, Botanical Garden, Tohoku University, Sendai, 980-0862 JAPAN;
bSchool of Pharmacy, Iwate Medical University, Yahaba, Iwate, 028-3694 JAPAN
*Corresponding author: [email protected]
Summary: A new combination, Monarthrocarpus
dolabriformis (Benth.) H. Ohashi & K. Ohashi is
proposed. This species is the second in the genus.
Desmodium dolabriforme Benth. was
accommodated in section Monarthrocarpus
(Merr.) H. Ohashi, when the genus
Monarthrocarpus was included in Desmodium
subgenus Podocarpium as a section (Ohashi
1973). Later the section was resurrected to a
distinct genus, but the species was transferred
to Hylodesmum (Ohashi and Mill 2000),
because the species has dolabriform articles as
indicated in the epithet (Fig. 1) and obliquely
depressed ovate seeds. These belong to a
typical morphological range of the articles
and seeds of the genus Hylodesmum, in
contrast to semilunar or narrowly rhombic
articles of Monarthrocarpus represented by
M. securiformis (Benth.) Merr. The shape
of articles is one of characteristic features of
Hylodesmum distinct from other genera of
the tribe Desmodieae except some species of
Desmodium. Hylodesmum dolabriforme (Benth.)
H. Ohashi & R. R. Mill differs, however, Fig. 1. Monarthrocarpus dolabriformis (Benth.) H. Ohashi
from other species of the genus in having & K. Ohashi. India. Courtallum. July 1835. Wight 227
(E).
diadelphous stamens of which the vexillary one
is scarcely connate with others, and 1-seeded
loments (Fig. 2) and in lacking secondary has monadelphous stamens, 2- or more-seeded
bracts, whereas other members in Hylodesmum loments and secondary bracts. In addition,
have monadelphous stamens, 2–5-seeded Monarthrocarpus is distinct from Hylodesmum
loments and secondary bracts (Ohashi 1973). in pollen morphology (Ohashi 1973), loment
Monarthrocarpus is characterized in having structure (Nemoto and Ohashi 2003) and
diadelphous stamens and 1-seeded loments, and molecular analyses (Kajita et al. unpublished).
in lacking secondary bracts, while Hylodesmum In the course of comprehensive taxonomic
December 2012 Journal of Japanese Botany Vol. 87 No.6 393
Fig. 2. Monarthrocarpus dolabriformis (Benth.) H. Ohashi & K. Ohashi (Wight 227, E). A. Loment showing 1-articulate pod. B. Apex of
the loment (a) in A. C. Apex of the loment (b) in A.
study of the tribe Desmodieae of the world, The species is very rare and may even be
we noted character states of secondary bracts extinct (Ohashi 1973, Ohashi and Mill 2000).
(present vs. absent) and stamens (monadelphous Kumar and Sane (2003) introduced Kerala, west
vs. diadelphous) are more effective than of Tamil Nadu, as a new record of distribution.
features of articles for classification of the Sanjappa (1992) recorded a disjunctive habitat
genera within the tribe. We consider, therefore, from south India in west India (Gujarat).
Hylodesmum dolabriforme should be transferred
to Monarthrocarpus. We propose a new We are grateful to Dr. T. Kajita of Chiba
combination of the species as follows: University for his information on unpublished
data from molecular analyses of Desmodieae
Monarthrocarpus dolabriformis (Benth.) and Professor T. Nemoto of Ishinomaki Senshu
H. Ohashi & K. Ohashi, comb. nov. University for his comments on our manuscript.
Desmodium dolabriforme Benth. in Miq., The loan of the specimen used in this study from
Pl. Jungh. 226 (1852); H. Ohashi in Ginkgoana E is gratefully acknowledged.
1: 126, fig. 37, pl. 15a (1973). Type: INDIA.
Tamil Nadu. Courtallum. Wight 791 (K–holo.; References
CAL, GH–iso.). Kumar S. and Sane P. V. 2003. Legumes of south Asia, a
Hylodesmum dolabriforme (Benth.) H. check-list. Royal Botanic Gardens, Kew.
Nemoto T. and Ohashi H. 2003. Diversity and evolution of
Ohashi & R. R. Mill in Edinb. J. Bot. 57: 176
anatomical structure of loments in tribe Desmodieae
(2000).
(Papilionoideae). In: Klitgaard B. B. and Bruneau A.
Distribution: South India (Kerala and (eds.), Advances in Legume Systematics. 10. Higher
Tamil Nadu), but recorded also from W. India Level Systematics. pp. 395–412. Royal Botanic
Gardens, Kew.
(Gujarat).
394 植物研究雑誌 第87巻 第6号 2012年12月
Ohashi H. 1973. The Asiatic Species of Desmodium and Its for Podocarpium (Leguminosae). Edinb. J. Bot. 57:
Allied Genera (Leguminosae). Ginkgoana 1. Academia 171–188.
(cid:54)(cid:70)(cid:76)(cid:72)(cid:81)(cid:87)(cid:76)(cid:191)(cid:70)(cid:3)(cid:37)(cid:82)(cid:82)(cid:78)(cid:15)(cid:3)(cid:44)(cid:81)(cid:70)(cid:17)(cid:15)(cid:3)(cid:55)(cid:82)(cid:78)(cid:92)(cid:82)(cid:17) Sanjappa M. 1992. Legumes of India. Bishen Singh
Ohashi H. and Mill R. R. 2000. Hylodesmum, a new name Mahendra, Pal Singh, Dehra Dun.
a b
大橋広好 ，大橋一晶 ：マメ科ヌスビトハギ連
Monarthrocarpusの1新組み合わせ
南インド産のヌスビトハギ属植物Hylodesmum 節果と種子の形の一致よりも重要な形質と考えられる．そ
dolabriforme (Benth.) H. Ohashi & R. R. Millの分類学的位 のため本種をMonarthrocarpusに移しM. dolabriformis
置を再検討した．本種はDesmodium dolabriforme Benth. (Benth.) H. Ohashi & K. Ohashiとした．ヌスビトハギ属は
として記載され，Desmodium subgenus Podocarpium 単体雄蕊で2個以上の小節果をもち二次苞葉がある．
section Monarthrocarpusに分類された(Ohashi 1973)． Monarthrocarpusはこの他にも花粉形態(Ohashi 1973)
後にMonarthrocarpus節は独立属，これを除く残りの と果皮構造(Nemoto and Ohashi 2003)でヌスビトハギ属と
Podocarpium亜属はHylodesmumヌスビトハギ属に分割さ は異なっており，分子系統解析(Kajita unpubl.)の結果でも
れた(Ohashi and Mill 2000)．Desmodium dolabriformeは 単系統と判断される．
小節果と種子の形がヌスビトハギ属に一致するため，ヌスビ （a東北大学植物園津田記念館，
トハギ属に分類された．しかし，ヌスビトハギ連全体をみる b岩手医科大学薬学部）
と二体雄蕊で1個の小節果をもち二次苞葉を欠くことが小
