Tripsacum dactyloides
Tripsacum lanceolatum
eastern gamagrass, gama grass
Mexican gamagrass
1-2(4) m tall, 3-5 mm thick, clumped.
1-2 m tall, 2-4 mm thick.
usually glabrous, occasionally slightly pilose;
ligules ciliate;
blades 30-75(120) cm long, 9-35(45) mm wide, flat, usually glabrous, tapering to attenuate apices.
inflorescences erect, with (1)2-3(6) rames;
rames 12-25 cm.
inflorescences with 4-7(10) rames.
spikelets 6-8 mm long, 3-5.5 mm wide.
spikelets 2-3 mm wide, beadlike in appearance.
spikelets all sessile or subsessile;
glumes 5-12 mm, coriaceous, blunt, acute, or bifid;
pedicels, when present, about 1 mm long, 0.5-0.8 mm wide, triangular in cross section, rigid.
spikelets in sessile-pedicellate pairs;
glumes 5-10 mm long, 1.5-2 mm wide, usually membranous, acute;
pedicels 2-5 mm long, less than 0.3 mm wide, almost flat to plano-convex in cross section, flexible.
sheaths hispid;
upper sheaths essentially glabrous;
ligules erose, not ciliate;
blades to 100 cm long, 8-30 mm wide, glabrous or slightly pubescent.
= 36, 54, 72.
= 72.
Tripsacum dactyloides
Tripsacum lanceolatum
Tripsacum dactyloides grows in water courses and limestone outcrops from the central and eastern United States through Mexico to northern South America. Plants from the United States and northern Mexico belong to Tripsacum dactyloides var. dactyloides. They differ from those of the other two varieties in their erect stems and sessile staminate spikelets. Narrow-bladed plants of T. dactyloides from Texas resemble T floridanum, but on transplanting to favorable conditions develop the wider blades characteristic of T. dactyloides. The two species can hybridize; the hybrids are partially sterile.
Growing Tripsacum dactyloides for forage has proven practical only in South America. It is also used as an ornamental grass, the chief attraction being its foliage.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Tripsacum lanceolatum grows in moist soil (often in canyon bottoms) of mountains from southeastern Arizona and southwestern New Mexico through Mexico to Guatemala. It has not been found in New Mexico since the 1800s.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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