From previous phylogenetic study, Mnesithea is most closely related to genus Hackelochloa on the large-scale Andropogoneae cladogram based on chloroplast and nuclear DNA sequences [1].
Guangdong, Guangxi, Hainan [Indonesia, Malaysia, Thailand, Vietnam].
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Perennial. Culms erect, 60–85 cm, softly pilose. Leaf sheaths densely pilose or with caducous tubercle-based hairs; leaf blades linear-lanceolate, 10–60 × 0.5–2 cm, tapering to base and apex, softly pubescent; ligule 1–2 mm, glabrous or ciliolate. Racemes solitary in the upper leaf axils, cylindrical, ca. 12 cm × ca. 2.5 mm, sessile spikelets paired at each node and separated by a pedicel, or occasionally only one sessile spikelet present; rachis internodes strongly clavate, marked with dark lines between the veins on narrow lower portion, base shortly bearded. Sessile spikelet 3–4 mm; lower glume obliquely ovate, with 6–8, prominent, riblike veins separated by deep slits, slits interrupted by tubercle-based hairs along their length, margins narrowly winged toward apex; upper glume keeled toward apex, keel winged; lower floret reduced; upper lemma and palea subequal. Pedicel free, linear, flattened, pilose, bearing a vestigial 0.5–1 mm spikelet. Fl. and fr. Jul–Nov.
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Rottboellia mollicoma Hance, J. Bot. 9: 134. 1871; Coelo-rachis mollicoma (Hance) Bor; Mnesithea pubescens Ridley.
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Possible type for Rottboellia mollicoma Hance
Catalog Number: US 101880
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): Collector unknown
Year Collected: 1862
Locality: Whampoa., China, Asia-Temperate
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Isotype for Rottboellia triflora F.T. Hubb.
Catalog Number: US 725213
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): G. Ledesma
Year Collected: 1913
Locality: Near Taytay., Palawan, Philippines, Asia-Tropical
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| Source | http://collections.mnh.si.edu/search/botany/?irn=2155924 |
Grassy hill slopes; 100–500 m.
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Mnesithea mollicoma is the only grass in China to have racemes usually with 2 sessile spikelets separated by a pedicel at each rachis node, although sometimes plants occur with some or all raceme segments bearing only 1 sessile spikelet. The species is also well marked by its softly hairy vegetative parts and ornamented sessile spikelet.
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