290 DECANDRIA PENTAGYNIA, 



314. ARENARIA. L, (Sand-wort.) 



Calix 5-leaved, spreading. Petals 5, entire. 

 Capsule 1-celled, many-seeded. 



Flowers axillary or terminal; leaves stipulate; flowers 

 sometimes with 5 to 8 stamina, and 5 styles. Seeds mem- 

 branaceously margined in Jl. rubra, and A. media. 



Species. I. A. peploides. On the sea-coast. 2. lateri- 

 jiora. Common in the mountainous parts of Pennsylvania. 

 3. serpyllifolia. 4. thymifoUa. 5. macrocarpa 6. patida. 

 7- sgiturrosa. 8. striata. 9. glabra. \(}- juniperina. 11. 

 iaricifolia. 12. fnsciculata. 13. canadensis. 



An European genus and many of the species alpine. 



Order IV.— TETRAGYNIA. 



315. MICROPETALON. Fersoon. Spergu- 

 XASTRUM. Mich, 



Calix 5-leaved, spreading. Petals 5, minute, 

 entire or none. Capsule ovate, 4-valved. 



Habit similar to Stellaria. 



Species. 1. M. lan^iginositm. 2. lanceolutum. 3. gra- 

 fmnewn. Is not this Stellaria graminea? 



A trifling genus which ought to be united with Stella- 

 ria. 



Order V.— PENTAGYNIA. 

 316. SPERGULA. L. (Spurrey.) 



Calix 5-leaved. Petals 5, entire. Capsule 

 ovate, 1-celled, 5-valved. 



Leaves verticillate, stipulate, or opposite and naked; 

 flowers axillary and terminal sometimes pentandrous. 

 Seeds mostly marginated. A genus partly distinguisha- 

 ble by habit from Arenariat but destitute of character. 



Species. 1. S. arvensis. 2 saginoides. Common In 

 sandy helda and upon rucks from New Jersey to North 

 Carolina. 



