HUDSONIA. XIX. CISTACE^E. 181 



1. L. MAJOR. Michx. (L. villosa. Ell. L. minor. Linn.) Larger Pinweed. 



Erect, hairy ; branches villous, radical ones prostrate ; cauline Ivs. ellipti- 

 cal, mucronate, those of the radical branches roundish, minute ; fls. small, nu- 

 merous, in fasciculate racemes, somewhat 1-sided. In dry woods^ U. S. and 

 Can. Stem 1 2f high, rigid, brittle, hairy, purple, paniculately branched. 

 Leaves of the stem about 1' long, alternate, opposite, or even verticillate on 

 the prostrate branches, crowded. Flowers brownish-purple, inconspicuous. 

 Capsule roundish, about the size of a large pin-head. Jl. Aug. 



2. L. MINOR. Lam. Smaller Pinweed. 



Erect, smoothish, branched ; Ivs. linear-lanceolate, acute ; panicle leafy, 

 its branches elongated ; fls. in nearly simple racemes ; caps, rather large. Grows 

 in dry, sandy grounds, U. S. and Can. Stem 8 12' high, often decumbent at 

 base. Stem leaves, 610" by 2 3", alternate, sparingly ciliate and revolute 

 at the margin, those of the long slender branches minute. Flowers nearly 

 twice as large as in L. major. Petals brownish purple, cohering at apex. Cap- 

 sule also rather larger than in L. major. Jn. Sept. 



3. L. THYMIPOLIA. Ph. Thyme-leaved Pinweed. 



Frutescent ; sts. decumbent at base, hoary with appressed hairs, very 

 branching and leafy ; root Ivs. on the short radical branches, imbricate, ellipti- 

 cal, very small ; cauline Ivs. linear or oblanceolate, often whorled. Sea-coasts, 

 Mass. ! to N. J. Stem about If high, rigid and very bushy. Upper leaves about 

 1' long, erect and crowded. Flowers in terminal and axillary clusters, on very 

 short pedicels. Petals brown. Capsules globose. Jl. Sep. 



2. HELIANTHEMUM. 



Gr. lyXtof, the sun, avSos . a flower. 



Sepals 5, the 2 outer smaller ; petals 5, or rarely 3, sometimes 

 abortive ; stamens 00 ; stigmas 3, scarcely distinct ; capsule triangu- 

 lar, 3-valved, opening at top ; seeds angular. Fls. yellow. 



1. H. CANADENSE. Michx. (Cistus Canad. Willd.} F^rost Plant. Rock Rose. 

 St. ascending ; branches erect, pubescent ; Ivs. alternate, without stipules, 



lanceolate, acute, hairy; petaliferous fls. few, large, terminal, apetalous ones late- 

 ral, solitary or racemose. In dry fields and woods, Can. to Flor. Stem about 

 If high, at length shrubby at base. Leaves 8 12" long, i as wide, entire, sub- 

 sessile. Flowers with large bright yellow petals, in a terminal corymb. The 

 axillary flowers later, very small, with very small petals, or apetalous. Sta- 

 mens decimate. Capsule smooth, shining, those of the apet. fls. not larger than 

 a pin's head. Seeds few, brown. Jn. Sep. 



2. H. CORYMBOSUM. Michx. (Heteromeris cymosa. Spach.) 



St. branching, canescent, erect ; Ivs. lance-oblong, canescently tomentose 

 beneath ; fls. in crowded, fastigiate cymes, the primary ones on elongated, filiform 

 pedicels, and with petals twice longer than the calyx; sep. villous-canescent, 

 outer ones linear, obtuse, inner ovate, acute. Sterile sands, N. J. to Ga. Plant 

 somewhat shrubby, very tomentose when young, at length diffusely branched, 

 about If high. Primary flowers about 1' diam. Secondary ones small, apeta- 

 lous. Jn. Aug. 



3. HUDSONIA. 



In honor of Wm. Hudson, author of " Flora Anglica." 



Sepals 3, united at base, subtended by 2 minute ones at dase ; pe- 

 tals 5 ; Stamens 9 30 ; style filiform, straight ; capsule 1 -celled, 3- 

 valved, many-seeded. Low shrubs with very numerous branches, and 

 minute exstipulate Ivs. 



1. H. TOMENTOSA. Nutt. Doicny Hudsonia. 



Hoary-tomentose ; Ivs. ovate, imbricate, acute, shorter than the intervals 

 of the stem ; fls. subsessile ; pet. obtuse. Shores of the ocean and lakes, N. J. 

 to N. H. ! and Wise., &c. Plant consisting of numerous slender, ascending 



