226 CLASS XIII. ORDER I. 



It is rernarkably distinct in its truncated petals, large pedicels, 

 and wliite, few seeded I'ruit. The herbage of these two species 

 and of A. spicata of Europe is precisely similar. 



230. CISTUS. 



^ Subgenus Helianthemum. Capsule one celled; septa in the 

 middle of the valves. 

 CisTus Canadensis. L. Canadian Cisius. 



Herbaceous, without sliptiles ; leaves alternate, 

 lanceolate, stem ascending. L. 

 Syn. Helianthemum Canadense. Mich. 



Stem slender, downy, hardly a foot high. Leaves small, nearly 

 sessile, lanceolate, obtuse, downy, white underneath. Flow- 

 ers lateral, solitary, yellow. Stamens inclined to the upper side. 

 Petals very tender and deciduous; after they have fallen, the 

 plant has the appearance of Lechea major, for which it has been 

 mistaken. — Sandy pastures and hills. — June. — Perennial. 



At the beginning of frosts, the bark cracks and rolls backward, 

 at which time the fragments are found connected by a mass of 

 fibrous, icy crytals. 



231 . HUDSONIA. 

 HuDsoNiA TOMENTOSA. Nutt. Downy Hudsonia. 



Canescent, tomentose; leaves ovate, imbricated, 

 shorter than the intervals of the stem ; flowers sub- 

 sessile ; calyx obtuse. 



A native of the sandy sea shore at Nantucket, Plum island, 

 and other places, forming dense, clustered thickets. The whole 

 plant is covered with whitish down. Stems ascending, studded 

 with short branches, which are covered with minute, acute, im- 

 bricated leaves. Flowers small, on short, lateral, leafy stalks. 

 Calyx of three leaves, two of which are bifid. Petals five, obo- 

 vate, bright yellow. Stamens about twenty; filaments a little 

 contorted, anthers roundish. Germ ovate, style crooked. — July. 



232. SARRACENIA. 



Sarracenia purpurea. L. Sidesaddle Flower. 



Leaves decumbent, shorter than the scape, inflated; 



