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| Deinostigma serratum F.Wen, L.N.Tuan & D.Dien, in Le, Le, Dinh, Tran & Wen, 2022. |
Abstract
Deinostigma serratum F.Wen, L.N.Tuan & D.Dien, a new species of Gesneriaceae is described and illustrated from the central Vietnam. It resembles D. eberhardtii in habit, but easily differs in several characters, especially in its odontoid margin of corolla petals. The ecological information, geographic distribution and conservation status of this new taxon are also provided here.
Keyword: Deinostigma eberhardtii, Didymocarpoideae, Flora of Vietnam, new taxon
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| Deinostigma serratum F.Wen, L.N.Tuan & D.Dien, A & B: Habitat. C: flowering plant compared with a hand. D: Plant. E: Cyme and lateral view of corolla. F: Frontal view of corolla. G: Top view of corolla. H: Adaxial surface of leaf blade. I: Abaxial surface of leaf blade. J: Flower and opened flower. K: Calyx lobes and pistil (style). L: Stamens and half of corolla tube. |
Deinostigma serratum F.Wen, L.N.Tuan & D.Dien, sp.
nov.
齒瓣奇柱苣苔
Diagnosis: Deinostigma serratum F.Wen, L.N.Tuan
& D.Dien can be easily distinguished from all species of
Deinostigma by its serrate margin of corolla lobes.
Further, it is the mostly similar to D. eberhardtii in plant
morphology, but it differs from the congener by leaf blade
shape (broadly ovate & apex subacute in D. serratum vs.
oblong, obovate, apex obovate, acute to slightly
acuminate in D. eberhardtii, same order followings) and
margin (shallowly obtuse-dentate or shallowly undulate-serrate vs. crenate); adaxial bracts indumentum
(glandular-pubescent vs. villous); shorter pedicel (0.8–1.0
cm long vs. 1.5–6 cm long); smaller corolla size (2.3–3.1
cm long vs. 3–3.3 cm long).
Etymology: The specific epithet ‘serratum’ is derived
from its special corolla lobes. All lobes have serrated
margin so that it can be easily distinguished from others
of Deinostigma.
Vernacular name: "Mỹ nhụy răng cưa" (Understood
as a species with a beautiful serrate lobes margins of
corolla lobes.
Distribution and ecology: Deinostigma serratum is
quite common in the moist shady areas under evergreen
broad-leaf forest at an altitude ranging from 350 to 450 m
asl. in type locality. The plants are growing in the moist
sloppy regions on the rocky crevices in association with
Liparis balansae Gagnep, Habenaria rhodocheila Hance,
Hoya crassipetiolata Aver., V.T.Pham & T.A.Le,
Podochilus microphyllus Lindl., and so on.
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| Photos of the relative, Deinostigma eberhardtii. A: Type specimen stored in E. B: flowering plant. C: cymose inflorescence. D: frontal view of corolla. E: lateral view of corolla. |
Tuan Anh Le, Ngoc Tuan Le, Dien Dinh, Minh Duc Tran and Fang Wen. 2022. Deinostigma serratum, A New Species of Gesneriaceae from central Vietnam. Taiwania. 67(1); 115 - 118. DOI: 10.6165/tai.2022.67.115
