TRIANDRIA. TRIGYNIA. 89 



die of agriculture and the arts. With the exception of a 

 variety of the T. caninum discovered in South America, 

 this genus appears ahiiost peculiar to Europe. 



122. LOLIUM. L. (Darnel.) 



Calix of une leaf, fixed to the rachis, many- 

 flowered. Flosculi distichally imbricated. Seed 

 coated by the corolla. — Spike simple. 



Species. 1. L. perenne- 2. temuleiitum. Introduced, 

 now naturalized. In this genus there are species which 

 sometimes produce an inner valve, in which case the Lo- 

 Hum approaches very near to Triticiim. 



Order 3. — Trigynia, 



123. HOLOSTEUM. L. 



Calix 5-leaved. Petals 5, eroded, orbiparteil. 

 Capsule 1-celled, subcylindric, bursting at the 

 summit. 



Leaves opposite; flowers axillarj' and terminal, in di- 

 chotomous corymbs, in H. wnbellatwn, umbellate, some- 

 times with 4 or 5 stamens, and 4 styles. 



Species. 1. H. succulentum. Probably nothing more 

 than Arenaria peploidesy which grows on the sea- coast 

 of New-Jersey, as this /ro/o*/e?(7« cannot now be found. 



A genus of but 6 species, of which there are 2 in the 

 West Indies, 1 in Malabar, and another in Europe. 



124. POLYCARPON. L. 



Calix 5-leaved. Petals 5, very short, emar- 

 ginate and persistent. Capsule ovate, 1 -celled, 

 2-valved. 



i: Leaves opposite, or verticillate in fours, furnished with 



scariose supules; flowers in a dichotomous terminal co- 

 rymb. 



Species. 1. P. tetraphylbim. Around Charleston, 

 (South Carolina) abundant.— Elliott. Probably intro- 

 duced. 



12 



