The Correct Interpretation of Euonymus auriculatus Craib (Celastraceae) and Myladenia serrata Airy Shaw (Euphorbiaceae).

4 Pages·2002·0.1 MB·English

by  Van Welzen, Peter C

NAT. HIST. BULL. SIAM Soc. 50(1): 111-114，2 002
The Correct Interpretation of Euonymus auriculatus Craib
(Celastraceae) and Myladenia serrata Airy Shaw (Euphorbiaceae)
ABSTRACT
Euonymus auriculatus Craib (Celas甘aceae)is as ynonym of Lasiococca comberi Haines
(Euphorbiaceae). The genus Lasiococca is an ew record for Thai1and. Myladenia serrata Airy
Shaw (Euphorbiaceae) is as ynonym of Xylosma longifolium Clos (Flacourtiac巴ae)
Key words: Euonymus，L asiococca，M yladenia，X ylosma，T ha1iand，s ynonymy
Euphorbiaceae are notoriously difficult to identify. In ar ecent pile of unidentified
Malesian Euphorbiaceae，se nt to Leiden (The Netherlands) for identification，9 0 percent
of the specimens appeared to belong to other families. Even experienced taxonomists s.till
make errors of judgement，es pecially when they have to interpret-to them-new forms.
This note deals with two species，o ne described in the Celastraceae，t he other in the
Euphorbiaceae.
Euonymus auriculatus Craib
CRAIB (1922) interpreted as pecimen collected by A. F. G. Kerr (Kerr 3620) in the
province of Chiang Mai (called Payap on the label)，T hailand. He considered it to be a
species of Euonymus (Celastraceae) and because ofthe densely echinate fruit，sh ort petioles
and cordate leaf base，it had to be an ew species. He subsequently described it as E.
auriculatus CRAIB (1922).
Recently，t he two type sheets of E. auriculatus from Aberdeen were sent for
identification to Hou in Leiden. Hou first thought that the species was described on the
basis of galled fruits，b ecause densely echinate fruits are absent in Euonymus. After
consultation with Van Balgooy the material landed on myd esk，be cause出eywere clearly
Euphorbiaceae.
Rather atypical for Euphorbiaceae were the subopposite or whorled leaves. Identification
of the two specimens was ab it troublesome，b ecause the plants looked like Erismanthus
(opposite leaves) or Epiprinus siletianus (Baill.) Croizat (whorled leaves)，bo th with cordate
leaf bases. Unfortunately，t hese taxa have smooth fruits. Recently，1 r evised the genus
Lasiococca for the Malay Archipelago (WELZEN，1 998). The species in血isgenus have
whorled，c ordate leaves and echinate fruits. The two duplicates def泊itelybelong to
Lasiococca. Lasiococca is ag enus still unknown for Thailand，w hich is quite curious
because the revision of the family is almost finished for the Flora of 官lailandproject.
Two years before Craib，in the same joumal，H AI悶 S(1920) described an ew species
of Lasiococca，L. comberi Haines. Euonymus auriculatus is synonymous with this species
because of the subbasal，s ubmarginal glands on the adaxial leaf surface，t he absence of
hair-側負 domatia，the pubescent inflorescences，a nd the broad tubercles on the仕uits.A
Received 29 November 2001; accepted 19 February 2002.
111
112 NOTES
凶ceplate can be found in K町(1982).Consequently E. auriculatus is placed into the
S戸lonymyof L. comberi:
Lasiococca comberi Haines (Euphorbiaceae)，B 凶1.Misc. Inf. Kew: 70 (1920); Kiu，A cta
Phytotax. Sinica 20: 108，F ig. 1( 1982).ーType:India，O rissa，A ngul，泊 rocky
ravines of the mountains of Mayurbhanj，C omber s.n. (K!).
=E uonymus auriculatus Craib (Cel出国.ceae)，Bull. Misc. Inf. Kew: 170 (1922).-Type:
τ
'hailand，P ayap，M eT a，K err 3620 (K，h olo; iso ABD!，2 s heets).
Dis釘ibution.-India，South China，N orth組 dNortheast Thailand，N orth Vietnam.
Habitat.一一Evergreenforest.
After pinpointing L. comberi as new record for Thailand，K . Phattarahirankanok and
K. Chayamarit 合omthe Forest Herbarium (BKF)泊 Bangkokdrew my attention to a
second specimen (Wo ngprasert s.nふ whichwas collected in the province of Loei
(Northeastern floristic dis住ict).
Myladenia sem仰 AiryShaw
AIRY SHAW (1972) made the first complete revision of all Euphorbiaceae for 百lailand，
am uch needed and excellent piece of work. In al ater addendum，A IRY SHAW (1977)
described an ew genus of Euphorbiaceae for Thailand，My ladenia，a m onotypic genus with
M. serraωA句 Shaw部 singlespecies.日is on1yk nown from血etype spec加en(V佃
Beusekom et al. 4104) which bears staminate flowers; pisti11ate flowers and仕uits釘e
τ
absent. 'hea bsence，es pecially，of the仕uitscaused the con白sion.百leisotype present泊
Leiden was originally identified as as pecies of Drypetes (Euphorbiaceae)恒 1971.Airy
Shaw changed this in 1974 into at entative Hydnocarpus，a F lacourtiaceae. In 1974，w hen
Sleumer (Leiden) was revising由isfamily for Flora Malesiana he readily re心ognisedit as
Xylosma longifolium Clos (Flacourtia印刷.Therefore血efollow均 nameshave to be
synonymized:
Xylosma G. Forst.，日.Ins. Austr. (1786) 72，n om. cons.-Lectotype: X. orbiculatum
，
(J. R. Forst. & G. Forst.) G. Forst. (based on Myro.巧lonorbiculatum J. R. Forst. &
G. Forstふ
=
Meliosma Airy Shaw，K ew Bull. 32 (1977) 29.一一Type:M. serrata Airy Shaw.
Xylosma longifolium Clos，A nn. Sci. Nat. Ser. 4.，B ot. 8( 1857) 231.ーType:Gaudichaud
260 (n.vふ
=M eliosma serrata Airy Shaw，[ Kew Bull. 31 (1976) 378，in obs.，n om. nud.] Kew Bull.
32 (1977) 79.-Type: Van Beusekom，Ge esink，Ph engkhlai & Wongwan 4104 (holo
K; iso L)，T hailand，E astern，C haiyaphum，N am Phrom，1 6.20 N，1 01.45 E.
Acknowledgments: It hank Ding Hou，M ax van Balgooy，a nd the Director of也e
Aberdeen herbarium for drawing my attention to one of血emisinterpretations presented
here. Kongkanda Chayamarit and Kanlaya Phattarahirankanok (BKF) ethanked for the
紅
泊formationon the second百聞spec加enof Lasiococca comberi Haines. J組 FritsVeldkamp
is thanked for his useful advice.
NOTES 113
REFERENCES
AIRY SHAW，H . K. 1972. The Euphorbiaceae of Siam. Kew Bull. 26: 191-363.
AIRY SHAW，H . K. 1977. Additions and corrections to the Euphorbiaceae of Siam. Kew Bull. 32: 69-83.
CRAIB，W . G. 1922. XXVI.一-Contributionsto the flora of Si訓 Bull.Misc. Inf: 165-174.
HAINES，H. H. 1920. IX.ー DecadesKewenses. Plantarum Novarum in Herbario Horti Regii Cons巴rvatarum.Bull.
Misc. Inf: 66ー71
KIu，H . S. 1982. Lasiococca Hook.f. (Euphorbiaceae) in China. Acta Phytotax. Sinica 20: 108-110，F ig. 1.
WELZEN，P. C. VA N. 1998. Revisions and phylogenies of Malesian Euphorbiaceae: Subtribe Lasiococcinae
(Homonoia，L asiococca，S pathiostemon) and Clonostylis，R icinus，a nd WetriaBlumea43: 131-164.
目
Peter C. van Welzen
Nationaal Herbarium Nederland，L eiden Universiteit Branch
P.O. Box 9514
2300 RAL eiden
The Netherlands
E-mail: [email protected].