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.

Perotis

HABIT Annual (13), or perennial (2). Rhizomes absent (13), or elongated (1). Culms erect (4/13), or geniculately ascending (8/13), or decumbent (5/13); 5–35.78–90 cm long; firm (12), or wiry (2). Ligule an eciliate membrane (12), or a fringe of hairs (2). Leaf-blades linear (3), or lanceolate, or ovate (4); stiff (1), or firm (13). Leaf-blade apex muticous (13), or pungent (1).

INFLORESCENCE Inflorescence composed of racemes; exserted (11), or embraced at base by subtending leaf (3).

Racemes single; multilateral. Rhachis angular (1/1). Spikelet packing crowded (8), or contiguous (7), or lax (2), or distant (1).

Spikelets appressed (1), or ascending (9), or spreading (9), or deflexed (1); solitary. Fertile spikelets sessile (5), or pedicelled (9). Pedicels oblong (7/7).

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear, or lanceolate (13); subterete; 1.2–4.282–11 mm long; falling entire. Spikelet callus brief (1), or square (1), or oblong (4), or linear (8); pubescent (3/3); base obtuse (2/4), or acute (1/4), or pungent (1/4).

GLUMES Glumes exceeding apex of florets; firmer than fertile lemma. Lower glume linear (2), or lanceolate (12); 1 length of upper glume; membranous (13/13); without keels (13/13); 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth (11), or asperulous (1), or scabrous (2); without pits; glabrous (6), or puberulous (2), or pilose (2), or hispidulous (6). Lower glume apex obtuse (1/13), or acuminate (12/13); awned. Upper glume linear (2), or lanceolate (12); 1.5–2.386–3.5 length of adjacent fertile lemma; membranous (13/13); without keels (13/13); 1 -veined. Upper glume surface smooth (11), or asperulous (1), or scabrous (2); glabrous (6), or puberulous (2), or pilose (2), or hispidulous (6). Upper glume apex acuminate (13/13); awned; 1 -awned.

FLORETS Fertile lemma lanceolate; hyaline (13), or membranous (1); without keel; wingless; 1 -veined. Lemma surface unwrinkled; without grooves. Lemma apex obtuse (2), or acute (12). Palea hyaline (12), or membranous (2); 0 -veined (3/3); without keels (3), or 2-keeled (11).

FLOWER Anthers 3 (13/13).

FRUIT Caryopsis with adherent pericarp (13/13); linear (1/10), or fusiform (9/10); isodiametric (3/11), or laterally compressed (1/11), or dorsally compressed (3/11), or flattened (4/11); biconvex (1/1). Embryo 0.3 length of caryopsis.

DISTRIBUTION Africa (11), or Temperate Asia (3), or Tropical Asia (3), or Australasia (3).

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