Agrostis stolonifera
Agrostis anadyrensis
agrostide stolonifere, carpet bentgrass, creeping bent, creeping bentgrass, fiorin, redtop, spreading bent
Anadyr bent
(8)15-60 cm, erect from a geniculate base, sometimes rooting at the lower nodes, with (2)4-7 nodes.
20-50 cm, erect.
mostly cauline;
sheaths smooth;
ligules longer than wide, dorsal surfaces usually scabrous, rarely smooth, apices usually rounded, acute to truncate, erose to lacerate, basal ligules 0.7-4 mm, upper ligules 3-7.5 mm;
blades 2-10 cm long, 2-6 mm wide, flat.
usually numerous;
ligules 0.6-3.5 mm, scabridulous, rounded, erose, sometimes lacerate, ciliate;
blades to 10 cm long, 3-4 mm wide, flat.
(3)4-20 cm long, less than 1/2 the length of the culm, 0.5-3(6) cm wide, narrowly contracted, dense, oblong to lanceolate, exserted from the sheaths at maturity, lowest node with 1-7 branches;
branches scabrous, ascending to appressed, except briefly spreading during anthesis, usually some branches at each node spikelet-bearing to the base, lower branches 2-6 cm;
pedicels 0.3-3.3 mm.
6-20 cm long, 1-4(8) cm wide, lanceolate to ovate, somewhat contracted but not spikelike;
branches erect, slender, scabrous;
pedicels 0.5-8 mm.
lanceolate, green and slightly to strongly suffused with purple.
lanceolate, greenish purple.
subequal to unequal, 1.6-3 mm, lanceolate, 1-veined, sometimes scabridulous distally, at least on the midvein, acute to acuminate or apiculate;
callus hairs to 0.5 mm, sparse;
lemmas 1.4-2 mm, opaque to translucent, smooth, 5-veined, veins obscure or prominent distally, apices acute to obtuse, entire or the veins excurrent to about 0.1 mm, usually unawned, rarely with a subapical straight awn to about 1 mm;
paleas 0.7-1.4 mm, veins visible;
anthers 3, 0.9-1.4 mm.
subequal, 2-3.5 mm, 1-veined, ciliate on the keels, otherwise smooth, acute;
callus hairs less than 76 the length of the lemma;
lemmas 1.6-3 mm, translucent, 5-veined, veins obscure or prominent distally, apices acute, entire, awned from above midlength, awns 1-1.5 mm, geniculate, exserted;
paleas absent;
anthers 3, 0.5-0.8 mm.
0.9-1.3 mm;
endosperm solid.
= 28, 35,42.
= 56.
Agrostis stolonifera
Agrostis anadyrensis
Agrostis stolonifera grows in areas that are often temporarily flooded, such as lakesides, marshes, salt marshes, lawns, and damp fields, as well as moist meadows, forest openings, and along streams. It will also colonize disturbed sites such as ditches, clearcuts, and overgrazed pastures. Its North American range extends from the subarctic into Mexico, mostly at low to middle elevations.
Agrostis stolonifera has been confused with A. gigantea (see previous). It is considered to be Eurasian, but some northern salt marsh and lakeside populations may be native. Agrostis stolonifera is also similar to A. castellana (p. 639); it differs in having longer, acute to truncate ligules that are longer than wide, and in possessing extensive stolons. The names A. palustris Huds. and A. maritima Lam. have been applied to plants with longer stolons; all forms intergrade. A hybrid between A. stolonifera and Polypogon monspeliensis, xAgropogon lutosus (p. 668), has been found in the Flora region. It differs from A. stolonifera in having awned glumes and lemmas. Agrostis stolonifera readily hybridizes with A. vinealis (see below), the hybrids being somewhat intermediate between the two parents.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Agrostis anadyrensis grows in sand and gravel shores of rivers and lakes, and in meadows and shrubby valleys in eastern Siberia. It has been reported by Tsvelev (1976) from arctic Russia and southern Alaska. Specimens from Alaska purporting to be A. anadyrensis so far have proven to be A. mertensii (see previous). Agrostis anadyrensis differs from A. mertensii in being more robust, with wider, more abundant basal leaves, larger panicles, and minor differences in the insertion of the awns on the lemmas. In addition, the panicle branches are strongly scabrous, with long acicules throughout their length, contrasting with the smooth to weakly scabrous branches of A. mertensii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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