TTRIANDRIA, DIGYNIA. 
47'. Pennisetum, Richard, 
51 
Involucrum composed of many setcs (or bris- 
tles.) Calix 2-valved, valves unequal, 2- 
flowered ; one of the flowers hermaphrodite, 
the other masculine (or rarely neuter) both 
sessile. (Flowers spiked, polygamous.) 
Nutt. 
1. P. spike cylindrical: involucels two-flowered, giaacam. 
hairy, fasciculate ; seeds crossed by undulate 
wrinkles, Sp. pi. 
Panicum glaucum, Willd. 
Very common, flowering all summer. Annual. 
2. P. spike terete sub-compound, undivided, invo- viride. 
lucels bristly small, seed nerved. Willd* 
Panicum viride, Willd. 
Not common, and seems to be introduced. Annual. July. 
3. P. spike verticillate, the little racemes in fours, verticiiia- 
involucels one-flowered two-bristled, culm diffuse. 
Willd* 
Panicum v.erticillatum, Willd. 
This species also seems to be introduced, common. Mr. 
Elliot has given Panicum alopicuroideum, of Walt., as a sy- 
nonym to No. 1., and Pursh adds it to the present species, 
saying, he has seen it in the herbarium of Walter. Annual. 
48. Digit ART A, Haller, Richard. 
Calix 2 or 3-valved, concave ; exterior valve 
minute, or none, second variable, the inner- 
most as long the corolla. Corolla 2-valved, 
oblong ovate, terete, and awnless. Style 
very long. Nectary cleft. Nutt. 
1. D. spikes expanding ; spikelets 2-flowered ; one sanguinaiis, 
sessile ; stem decumbent, creeping. 
