GrassBase - The Online World Grass Flora

Descriptions

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

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

Poecilostachys

HABIT Annual (3), or perennial (13). Rhizomes absent (15), or elongated (1). Culms erect (2), or geniculately ascending (3), or decumbent (5), or prostrate (5), or rambling (4); slender (2/2); 18–53.47–200 cm long; rooting from lower nodes (6/6). Culm-internodes terete (1/1). Lateral branches sparse (1/5), or ample (5/5). Leaf-sheath auricles absent (12), or erect (5). Ligule an eciliate membrane (5), or a ciliolate membrane (5), or a ciliate membrane (6). Leaf-blades aciculate (1), or linear (2), or lanceolate (14), or oblong (1). Leaf-blade venation without cross veins (14), or with obscure cross veins (2).

INFLORESCENCE Inflorescence composed of racemes.

Racemes single (1), or borne along a central axis (15); erect (1), or ascending (14), or spreading (1); unilateral (15/15); bearing few fertile spikelets (1), or many spikelets (15). Rhachis angular (15/15). Spikelet packing crowded (2), or contiguous (11), or lax (3).

Spikelets solitary (4), or in pairs (14). Fertile spikelets sessile (2), or sessile and pedicelled (6), or pedicelled (8); 1 in the cluster (3/14), or 2 in the cluster (14/14); subequal (11/11), or the lower smaller (10/11). Pedicels tip cupuliform (1/1).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets (15/15); 1 fertile florets (15/15); without rhachilla extension (15/15). Spikelets linear (1), or lanceolate (9), or oblong (8); laterally compressed; 4.15–5.914–8 mm long; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma (15), or similar to fertile lemma in texture (1). Lower glume lanceolate (10), or ovate (7); 1–1.05–1.1 length of upper glume; membranous (13/15), or herbaceous (2/15); without keels (2/15), or 1-keeled (13/15); 3 -veined (5), or 4 -veined (2), or 5 -veined (12), or 6 -veined (3), or 7 -veined (4). Lower glume surface smooth (13), or asperulous (2), or scabrous (1); without pits; glabrous (12), or pubescent (1), or pilose (3), or setose (1). Lower glume apex truncate (2/13), or obtuse (1/13), or acute (7/13), or acuminate (3/13); muticous (4), or mucronate (4), or awned (12). Upper glume lanceolate (9), or oblong (2), or ovate (6); membranous (13/15), or herbaceous (2/15); without keels (3/15), or 1-keeled (12/15); 3 -veined (4), or 4 -veined (1), or 5 -veined (11), or 6 -veined (4), or 7 -veined (6). Upper glume surface smooth (15), or asperulous (1); glabrous (12), or puberulous (1), or pubescent (2), or pilose (1), or setose (1); with simple hairs (4/5), or tubercle-based hairs (1/5). Upper glume apex truncate (1/15), or obtuse (3/15), or acute (9/15), or acuminate (2/15); muticous (12), or mucronate (5), or awned (1); 1 -awned (1/1).

FLORETS Basal sterile florets barren; with palea (2), or without significant palea (15). Lemma of lower sterile floret lanceolate (7/15), or elliptic (4/15), or ovate (5/15); membranous (13/14), or herbaceous (1/14); 5 -veined (8/14), or 6 -veined (3/14), or 7 -veined (9/14), or 8–9 -veined (1/14); obtuse (2/14), or acute (11/14), or attenuate (1/14); muticous (14/15), or mucronate (1/15). Fertile lemma lanceolate (6), or elliptic (1), or oblong (2), or ovate (7); laterally compressed; chartaceous (1), or cartilaginous (14), or coriaceous (1); without keel (15), or keeled (1); wingless; 3 -veined (3/7), or 5 -veined (4/7). Lemma surface unwrinkled; without grooves. Lemma margins flat (2), or involute (1), or convolute (13); exposing palea (3), or covering most of palea (13). Lemma apex obtuse (1/15), or acute (12/15), or acuminate (1/15), or attenuate (1/15). Palea not rolled (1), or involute (15); membranous (1), or cartilaginous (14), or coriaceous (1); 2 -veined (8/8); without keels (10), or 2-keeled (6).

FLOWER Anthers 3 (7/7).

DISTRIBUTION Africa.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.