334 NATURAL HISTORY OF PLANTS. 
genus Cistus. In Hudsonia: there is, with the same perianth and 
androceum as in Cistus, three carpels and three placentas ; but upon 
each of these only two ovules, similar to those of Helianthemum. 
This small genus contains three species,’ of North America, with 
frutescent or subfrutescent stem, small alternate imbricated leaves, 
analogous to those of the heather (Fr., Bruyère), and small yellow 
flowers, terminal, solitary, pedunculate, near together on small gem- 
Lechea mexicana. 

Fra. 349. 
Floriferous branch. 
Fie, 351. 
Fie. 350. 
Long. sect. of flower (5). Flower with perianth 
taken away. 
miform branches. JZechea’ has only trimerous flowers, sometimes 
dimorphous, apetalous, with few stamens, an ovary with biovulate 
placentas, and a style with three stigmatiferous fimbriate divisions. 
The four or five known species‘ are also of North America, herba- 
ceous or suffrutescent, with flowers disposed in racemes of cymes or 

1 L., Mantiss, n. 1263.—J., Gen., 162.— 
GæÆRIN. F., Fruct., iii. 152, t. 407.—Lamx., Zl. 
t.407.—Dux., in DC., Prodr., i. 284,—Spaou, 
loc. cit., 372; Suit. à Buffon, vi. 113.—ENDt., 
Gen., n. 5031.—A Gray, Gen. Ill, t. 90.— 
B. H., Gen., 114, n. 3. 
2 A. Gray, Man., ed. 5, 81.—Cuarm., Fl. 
S. Unit. St., 36.—Watp., Rep., i. 213. 
3 L., Gen., n.109.—J., Gen., 303.—GÆRTN., 
Fruct., ii. 222, t. 129.—DC., Prodr., i. 285.— 
Sracn, loc. cit., 371.—ENDL., Gen., n. 5030,— 
Payer, Fam. Nat., 146.—A. Gray, Gen. Iil., 
t. 88, 89—B. H., Gen., 114, n. 4.—Lechidium 
Spacu, in Ann, Se. Nat., sér. 2, vi. 372. 
4 Lamx., Til, t. 281, fig. 3 (Gaura)—A. 
Gray, Man. ed. 5, 81.—Torr. & Gray, Fl. 
N.-Amer., i. 152,—Cuarm., Fl. S. Unit. St., 
36.—Spacu, in Comp. to Bot. Mag., ii. 282, 
286,—WaALP., Rep., i. 212; v. 58 b. 
