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.

Pseudoraphis

HABIT Perennial. Stolons absent (1), or present (6). Culms prostrate; slender (1/1); 10–29.64–50 cm long; rooting from lower nodes (4/4). Lateral branches ample (1/1). Leaf-sheath auricles absent (6), or erect (1). Ligule an eciliate membrane (4), or a ciliolate membrane (3), or a ciliate membrane (1).

INFLORESCENCE Inflorescence composed of racemes; exserted (5), or embraced at base by subtending leaf (2).

Racemes borne along a central axis; appressed (2), or erect (1), or ascending (2), or spreading (3); bearing 1 spikelet (3), or few fertile spikelets (2), or many spikelets (4); bearing 1 fertile spikelets on each (4), or 2 fertile spikelets on each (5), or 3 fertile spikelets on each (2), or 4 fertile spikelets on each (1), or 5–10 fertile spikelets on each (2). Rhachis angular; terminating in a barren extension; extension bristle-like. Spikelet packing abaxial; contiguous (5), or distant (2).

Spikelets appressed; solitary. Fertile spikelets sessile (6), or pedicelled (1).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 3.5–6.035–10 mm long; falling entire. Spikelet callus brief (5), or oblong (2). Rhachilla internodes brief up to lowest fertile floret (6), or elongated below proximal fertile floret (1).

GLUMES Glumes shorter than spikelet (1), or reaching apex of florets (2), or exceeding apex of florets (4); thinner than fertile lemma. Lower glume oblong (1), or oblate (6); hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume surface without pits. Lower glume apex truncate (1), or obtuse (6). Upper glume lanceolate (3), or elliptic (4); membranous; without keels; 7 -veined (5), or 8–9 -veined (3), or 10–11 -veined (1), or 13–15 -veined (2). Upper glume surface smooth (6), or asperulous (1), or scabrous (2); glabrous (6), or pubescent (1), or pilose (1). Upper glume apex obtuse (1), or acuminate (1), or attenuate (3), or cuspidate (2), or caudate (1); muticous (6), or awned (1); 1 -awned (1/1).

FLORETS Basal sterile florets male, or barren (1); with palea. Lemma of lower sterile floret lanceolate (1), or elliptic (6); membranous; 5–6 -veined (1/6), or 7 -veined (4/6), or 8–9 -veined (2/6), or 11–13 -veined (1/6); obtuse (1), or acute (3), or acuminate (2), or attenuate (1); muticous (6), or awned (1). Fertile florets bisexual (5), or female (2). Fertile lemma lanceolate (1), or elliptic (3), or oblong (3); membranous (1), or chartaceous (1), or cartilaginous (5); without keel; wingless; 5 -veined (3/3). Lemma surface unwrinkled; without grooves. Lemma apex obtuse (3), or acute (4). Palea embraced by lemma (5), or separating from lemma above (2); 1 length of lemma; membranous (1), or chartaceous (1), or cartilaginous (5); without keels.

FLOWER Anthers 2 (2/6), or 3 (4/6).

FRUIT Caryopsis with adherent pericarp (4/4); ellipsoid (2/3), or ovoid (1/3). Embryo 0.33 length of caryopsis. Hilum linear (1/1).

DISTRIBUTION Temperate Asia (4), or Tropical Asia (5), or Australasia (3).

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