Genus i. 



ROCK-ROSE FAMILY. 



541 



3. Crocanthemum corymbosum 



(Michx.) Britton. Pine-barren 

 Frostweed. Fig. 291 1. 



Helianthemum corymbosum Michx. Fl. Bor. Am. 

 1 : 307. 1803. 



Erect, branching from the base, 6'-i2' high, 

 finely and densely canescent. Leaves oblong, 

 or the lowest obovate, lo"-i6" long, obtuse or 

 acutish, z"~S" wide, entire, slightly revolute 

 in drying, pale beneath, dark green above, 

 short-petioled ; flowers in nearly naked, f as- 

 tigiate cymes at the summits of the stem and 

 branches; the petaliferous 6"-io" broad, on 

 slender pedicels 6"-8" long; apetalous flowers 

 clustered, nearly sessile ; calyx of both kinds 

 woolly-pubescent; outer sepals about equalling 

 the inner; capsules of the larger flowers 2"-3" 

 broad, many-seeded ; those of the apetalous 

 ones smaller and few-seeded. 



In sandy soil, New Jersey ( ?), North Carolina 

 to Florida and Louisiana. 



2. HUDSONIA L. Mant. 11, 74. 1767. 



Low tufted diffusely branched shrubs, with small subulate or scale-like, imbricated leaves, 

 and numerous yellow flowers terminating short branches. Petals 5, obovate-oblong. Stameng 

 =0. Style filiform, continuous with the ovary; placentae 3; stigma minute. Capsule l-celled, 

 3-valved, included in the calyx. Seeds few; embryo slender, spirally curved. [Named for 

 Wm. Hudson, 1730-1793, an English botanist.] 



A genus of 3 species, natives of eastern North America, one inhabiting mountain tops in North 

 Carolina. Plants of heath-like aspect, very showy when in bloom. Type species : Hudsonia 

 ericoides L. 



Flowers slender-pedicelled ; leaves subulate. 



Flowers nearly sessile or short-pedicelled ; leaves scale-like. 



H. ericoides. 

 H. tomentosa. 



I. Hudsonia ericoides L. Heath-like 

 Hudsonia. Fig. 2912. 



Hudsonia ericoides L. Mant. I : 74. 1767- 



Bushy-branched from the base, greenish, softly- 

 pubescent throughout, 4'-;' high, the principal 

 branches slender, ascending. Leaves subulate, 

 3"-4" long, somewhat spreading, densely imbri- 

 cated on the younger branches, more scattered 

 on the older ones ; pedicels very slender, s"-8" 

 long; flowers numerous, about 4" broad; sepals 

 2"-3" long, acutish; stamens 12-18; capsule ob- 

 long, slightly pubescent ; seeds about 3. 



In dry sandy soil, especially in pine-barrens, mainly 

 near the coast, Newfoundland to New York and Vir- 

 ginia. Field-pine. Poverty-grass. American heath. 

 May-June. 



