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.

Stipagrostis

HABIT Annual (6), or perennial (51). Rhizomes absent (41), or short (5), or elongated (12). Stolons absent, or present (1). Culms erect (17/28), or geniculately ascending (14/28), or decumbent (6/28); reed-like (1/2), or slender (1/2); 2–45.92–200 cm long; firm (50), or wiry (2), or woody (4); without nodal roots (1/1), or rooting from lower nodes (1/1). Culm-internodes similar in length (1/2), or unequal, the upper longer (1/2); terete (1/1). Lateral branches lacking (12/29), or sparse (3/29), or ample (2/29), or fastigiate (4/29), or suffrutescent (13/29). Ligule a fringe of hairs. Leaf-blades persistent (52), or deciduous at the ligule (4); aciculate (11), or filiform (31), or linear (14), or lanceolate (1); herbaceous (52), or coriaceous (4); stiff (19), or firm (37). Leaf-blade midrib indistinct (1/1). Leaf-blade apex muticous (40), or pungent (17).

INFLORESCENCE Inflorescence a panicle; subtended by an unspecialized leaf-sheath (55), or an inflated leaf-sheath (1); exserted (46), or embraced at base by subtending leaf (15).

Panicle open (34/55), or contracted (24/55), or spiciform (3/55).

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform (1/1); tip widened (1/1).

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear (2), or lanceolate (54); subterete; 6.225–14.28–50 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident (5), or elongated (51); pubescent (35/55), or pilose (7/55), or bearded (14/55); obtuse (2), or acute (17), or pungent (36), or 2-toothed (1).

GLUMES Glumes persistent; exceeding apex of florets (54/54); thinner than fertile lemma (53), or similar to fertile lemma in texture (3). Lower glume linear (4/55), or lanceolate (54/55), or oblong (1/55); 0.5–1.014–8 length of upper glume; membranous (46), or chartaceous (9), or cartilaginous (1); without keels (52/54), or 1-keeled (3/54); 1 -veined (2), or 3 -veined (49), or 4 -veined (4), or 5 -veined (7), or 6 -veined (2), or 7 -veined (4), or 8–9 -veined (3). Lower glume lateral veins absent (2), or distinct (54); without ribs (52/54), or ribbed (2/54). Lower glume surface smooth (43), or asperulous (10), or scabrous (3); without pits; glabrous (46), or puberulous (4), or pubescent (1), or pilose (12). Lower glume apex emarginate (3/55), or truncate (2/55), or obtuse (7/55), or acute (10/55), or acuminate (33/55), or attenuate (4/55), or setaceously attenuate (1/55); muticous (51/55), or mucronate (3/55), or awned (2/55). Upper glume linear (5/55), or lanceolate (53/55), or oblong (1/55); 1.1–2.699–5 length of adjacent fertile lemma; membranous (46), or chartaceous (9), or cartilaginous (1); without keels (52/54), or 1-keeled (2/54); 1 -veined (5), or 2 -veined (3), or 3 -veined (50), or 4 -veined (3), or 5 -veined (6), or 7–9 -veined (1). Upper glume lateral veins without ribs (53/54), or ribbed (1/54). Upper glume surface smooth (45), or asperulous (9), or scabrous (2); glabrous (47), or puberulous (4), or pubescent (1), or pilose (8); without hair tufts (55), or with basal tufts of hair (1). Upper glume apex entire (54), or dentate (2); 2 -fid (1/1); emarginate (1/54), or truncate (2/54), or obtuse (4/54), or acute (15/54), or acuminate (31/54), or attenuate (5/54), or setaceously attenuate (1/54); muticous (50/55), or mucronate (6/55), or awned (2/55); 1 -awned (2/2).

FLORETS Fertile lemma lanceolate (5), or elliptic (1), or oblong (51); subterete (19/19); chartaceous (3), or coriaceous (53); without keel (54/54); wingless; 3 -veined (54/54). Lemma surface smooth (45), or granulose (1), or scaberulous (4), or scabrous (2), or papillose (2), or tuberculate (2), or punctate (2); unwrinkled; without grooves. Lemma margins flat (1), or convolute (55); exposing palea (2), or covering most of palea (54). Lemma apex emarginate (1/53), or acute (52/53); without ornament (55), or tuberculate (1); awned; 1 -awned (1), or 3 -awned (55). Principal lemma awn straight (2), or geniculate (1), or 3-branched (53); limb glabrous (1), or ciliate (1), or plumose (54). Column of lemma awn glabrous (49/54), or pubescent (1/54), or ciliate (4/54), or plumose (1/54); without distinct apical hairs (51/54), or with bearded apex (3/54). Lateral lemma awns longer than principal (1/54), or subequal to principal (10/54), or shorter than principal (43/54). Palea present (55), or absent or minute (1); not rolled (54/55), or involute (1/55); 0.1–0.3446–0.5 length of lemma; membranous (53/55), or chartaceous (2/55); 0 -veined (1/4), or 2 -veined (3/4); without keels (53/55), or 2-keeled (2/55).

FLOWER Lodicules 2 (4/4); membranous (3/3). Anthers 3 (5/5). Ovary glabrous (1/1).

FRUIT Caryopsis with adherent pericarp (22/22); linear (1/20), or fusiform (9/20), or ellipsoid (5/20), or oblong (2/20), or obovoid (1/20), or oblanceolate (2/20); isodiametric (1/2), or dorsally compressed (1/2). Embryo 0.3–0.4419–0.66 length of caryopsis. Hilum linear (15/15); 0.33–0.922–1 length of caryopsis.

DISTRIBUTION Europe (2), or Africa (48), or Temperate Asia (23), or Tropical Asia (6).

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