MANUAL OF THE GRASSES OF THE UNITED STATES 



693 





Figure 1054. — Panicum trichoides. Panicle, X 1. (Runyon 1873, Tex.); two views of spikelet, and floret, X 10. 



(Type.) 



irritation to the skin when handled; 

 blades flat, as much as 60 cm. long 

 and 3.5 cm. wide, glabrous; panicle 20 

 to 35 cm. long, at first condensed, 

 finally open, the branches ascending; 

 spikelets 2 to 2.2 mm. long. % — 

 Open moist ground, southern Texas; 

 tropical America at low altitudes. 



7. Trichoidea. — Decumbent, spread- 

 ing, freely branching annual; 

 blades ovate to ovate-lanceolate; 

 panicles diffuse, with capillary 

 branches; spikelets minute. 

 145. Panicum trichoides Swartz. 

 (Fig. 1054.) Culms slender, widely 

 creeping; freely branching; sheaths 

 mostly longer than the internodes, 



Figuee 1053. — Panicum hirsutum. Two views of 

 spikelet, and floret, X 10. (Type.) 



144. Panicum hirsutum Swartz. 

 (Fig. 1053.) Culms robust, erect, as 

 much as 1.5 m. tall and 1 cm. thick, 

 simple or branched at base only; 

 nodes appressed-pubescent ; sheaths 

 papillose-hirsute, the hairs stiff, 

 spreading, fragile, causing mechanical 



