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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Stipagrostis hermannii

HABIT Annual; caespitose; clumped loosely. Culms geniculately ascending; 5–15 cm long; 2–4 -noded. Culm-internodes distally pubescent. Leaf-sheaths antrorsely scabrous; outer margin hairy. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades conduplicate, or convolute; 1–2 cm long; 1–2 mm wide. Leaf-blade surface scabrous; rough on both sides.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle open; oblong, or ovate; dense; 4–8 cm long. Panicle axis scabrous. Panicle branches scabrous; pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 9–12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1–1.25 mm long; bearded; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 9–12 mm long; 1.1–1.2 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface asperulous. Lower glume apex setaceously attenuate. Upper glume lanceolate; 8–10 mm long; 2–2.5 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume surface asperulous; rough above. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma oblong; 3.5–4 mm long; coriaceous; without keel; 3 -veined. Lemma surface scaberulous. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; with 20–40 mm long limb; with twisted column; deciduous; abscissing from top of lemma; limb plumose; glabrescent towards base of limb. Column of lemma awn 1–10.5 mm long; ciliate; hairy on upper part. Lateral lemma awns 10–15 mm long; shorter than principal; glabrous. Palea without keels.

FRUIT Caryopsis with adherent pericarp; ellipsoid. Embryo 0.33 length of caryopsis. Hilum linear; 1 length of caryopsis.

DISTRIBUTION Africa: southern tropical and south.

NOTES Aristideae. De Winter 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.