OCTANDRIA. MONOGTNIA. 549 



bury, F. L. S. Flower by cultivation nearly 6 inchesin dia- 

 meter, and the leaves then become lanceolate. 



An American genus, extending through Peru and Chili 

 into Patagonia, with the exception of 2 species at the Cape 

 of Good Hope. 



361. CLARKIA. Pursh. 



Calix 4-cleft, tubulous. Corolla of 4 petals, 

 unguiciilate, cruciately 3-Iobed. Stamina 4 im- 

 perfect, with roundish anthers. Stigma peta- 

 loid, 4-lobed. Capsule 4-celled. 



A biennial or annual and herbaceous plant, with the en- 

 tire habit of (Enotheva. Leaves alternate, narrow; flowers 

 altemate, subsessile, purple. 



Species. 1. C pulchella. v. s. Discovered in Northern 

 California by the late governor Lewis, on the banks of two 

 of the principal branches of the Columbia. 



362. GAURA. L, 



Calix 4-cleft, tuhular. Corolla of 4 petals, as- 

 cending towards the upper side. JV\if quadran- 

 lar, 1 to 4-seeded. 



Habit similar to (Enothera, to the last section of which 

 it closely approaches. Leaves alternate, flowers spiked, 

 mostly rosaceous. Germ 4 or more seeded; capsule by 

 abortion 1-seeded. (Leaves impunctate.) 



Species. 1. G. biemiis. 2. ujigiistifolia. 3. * cocdnea. 

 Perennial; stems simple, decumbent, several from the 

 same root; leaves linear-lanceolate, repandly denticulate, 

 canescent and partly villous; raceme lax, many-flowered, 

 petals roundish, filiformly unguiculate, a little longer than 

 the calix; stigma 4-toothed; fruit acute at both extremi- 

 ties, 4-seeded. Hab. On the declivities of bare gravelly 

 hills, from the Maha village to the Mandans. About a foot 

 high, covered with a short and hoary villous pubescence, 

 leaves crowded; flowers at flrst tose colour, at length be- 

 coming pale scarlet. Flowei'ing in May. 



Of this genus there are 2 other species in Mexico and 

 1 in tropical America. 



363. EPILOBIUM. L. (Willow-herb.) 



Calix 4-cleft, tubulous. Corolla of 4 petalsJ 

 Capsule oblong inferior. Seeds comose. 



