Living Collection Virtual Herbarium

Poaceae
Hyparrhenia rufa (Nees) Stapf

Verified by: Temperate sect. 15 December 2009
Notes: Verified with Clayton, W.D. 'A revision of the genus Hyparrhenia' Kew Bulletin Add.ser. 2. 1969. Polydistachyophorum sect. Tall plants with narrow leaves. Ligule membranous acute, dissected and ciliate hairy. Inflorescences of paired divaricate racemes. One sessile one short pedunculate. Peduncle hairy at base and flattened. Spatheoles narrow. Racemes of several paired spikelets. Spikelets pair one short the other pedicellate. Spikelets 1 homogamous at base and several at apex. Spikelets heterogamous in the middle, pedicellate awned. Spikelets two flowered, sessile one with ruffous hairy upper glumme and glossy lower glumme, heterogamous one with long awned lemma, styles 2 feathery and short, stamens 3. Sessile spikelet with rounded apex callus. Pedicellate spikelets with aborted flowers. Awn per raceme pair = 9-10. Part of a complex group of species.
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Locality: Madagascar, Fianarantsoa, Ambatofindrahana, 1km to the east of Ambatofindrahana, towards Usine Magrama.
Coordinates: 20º34'25'' S, 46º48'43'' E 1404m
Field notes: Degraded Savanna. Associated with Pinus sp., Euphorbia stenoclada, Ferralitic soil, red soild. Slope 5 degrees. MSB number 393548.

raceme raceme

spikelet spikelet

racemes peduncles racemes peduncles

raceme rachis raceme rachis

homogamous sessile spikelet lower glume homogamous sessile spikelet lower glume

homogamous sessile spikelet upper glume homogamous sessile spikelet upper glume

paired heterogamous spikelets paired heterogamous spikelets

awn awn

heterogamous sessile spikelet heterogamous sessile spikelet

heterogamous sessile spikelet heterogamous sessile spikelet

ligule ligule

ligule ligule

leaf margin leaf margin

adaxial leaf surface adaxial leaf surface

abaxial leaf surface abaxial leaf surface

flowering branch

inflorescence

inflorescence
ligule
inflorescence