CISTACEAE. 631 



1. 5-3- 5 cm. long, stellate-canescent beneath, darker above, short -petioled; petalif- 

 erous flowers 5-12 in a terminal cymose raceme, their corollas 1.5-2.5 cm. broad, 

 light yellow, their sepals densely canescent, the outer nearly as long as the inner, 

 their capsules ovoid; apetalous flowers appearing later, minute, clustered, nearly 

 sessile; seeds evenly reticulated. In dry soil, N. S. to S. Dak., Neb., N. Car. 

 and Tex. June-July. 



2. Helianthemum Canadense (L.) Michx. FROST-WORT. (I. F. f. 2471.) 

 Puberulent -canescent, erect, ascending, or sometimes diffuse, 0.7-6 dm. high. 

 Leaves oblong, linear-oblong or oblanceolate, nearly sessile, 1-3 cm. long, rough 

 and dark green above, paler and canescent beneath, the margins commonly revo- 

 lute in drying; petaliferous flowers solitary, or rarely 2, bright yellow, 2-3 cm. 

 broad, their sepals pilose, the outer shorter than the inner, their capsules ovoid or 

 obovoid, rounded above. In dry rocky or sandy soil, Me. to Ont., Wis., N. Car. 

 and Ky. Petaliferous flowers May-July. 



3. Helianthemum corymbosum Michx. PINE-BARREN FROSTWEED. (I. F. f. 

 2472.) Erect, 1.5-3 dm. high, densely canescent. Leaves oblong, or the lowest 

 obovate. 2-3 cm. long, entire, slightly revolute in drying, pale beneath, dark green 

 above, short-petioled ; flowers in nearly naked, fastigiate cymes, the petaliferous 

 1-2 cm. broad, on pedicels 12-16 mm. long; apetalous flowers clustered, nearly 

 sessile; calyx of both kinds woolly-pubescent; outer sepals about equalling the 

 inner; capsules of the larger flowers 4-6 mm. broad, many-seeded; those of the 

 apetalous ones smaller, few-seeded. In sandy soil, Va. (?), N. Car. to Fla. and La. 



2. HUDSONIA L. 



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

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

 oblong. Stamens oo . Style filiform, continuous with the ovary ; placentae 3 ; 

 stigma minute. Capsule 3-valved, included in the calyx. Seeds few; embryo 

 slender, spirally curved. [Named for Wm. Hudson, 1730-1793, an English bota- 

 nist.] A genus of 3 species, natives of eastern N. Am. 



Flowers slender-pedicelled ; leaves subulate. i. //. ericoides. 



Flowers nearly sessile ; leaves scale-like. 2. //. tomentosa. 



1. Hudsonia ericoides L. HEATH-LIKE HUDSONIA. (I. F. f. 2473.) Bushy- 

 branched, greenish, softly- pubescent, 1-2 dm. high. Leaves subulate, 6-8 mm. 

 long, densely imbricated on the younger branches, more scattered on the older 

 ones; pedicels 10-16 mm. long; flowers about 8 mm. broad; sepals acutish; 

 stamens 12-18; capsule oblong, slightly pubescent; seeds about 3. In dry sandy 

 soil, N. S. to Vt. and Va. May-June. 



2. Hudsonia tomentosa Nutt. WOOLLY HUDSONIA. FALSE HEATHER. 

 BEACH HEATHER. (I. F. f. 2474.) Densely tufted and intricately branched, 

 hoary-pubescent, pale, 1-2 dm. high. Leaves 2 mm. long, oval or oblong, imbri- 

 cated and appressed ; flowers sessile, or on pedicels less than 2 mm. long, slightly 

 smaller than those of the preceding; sepals obtuse; stamens 9-18; capsule ovoid, 

 glabrous, usually i-seeded. Mostly in sands of the seashore and in pine-barrens, 

 Va. to N. H., N. B., and on lake and river shores west to Slave Lake and the Lake 

 of the Woods. May-July. 



3. LECHEA L. 



Perennial herbs, often woody at the base, with small entire leaves and minute 

 panicled greenish or purplish flowers. Sepals 5, the 2 outer smaller and narrower. 

 Petals 3, ovate to linear, inconspicuous, persistent. Stamens 3-12. Stigmas 3, 

 nearly sessile, laciniate. Capsule 3-valved, 3-celled, or by obliteration of the dis- 

 sepiments i-celled, about 6-seeded. Embryo curved or spiral. [Named for Johan 

 Leche, a Swedish botanist, died 1764.] About of 14 species, n natives of eastern 

 N. Am., i Texan, I Cuban and I Mexican. The characteristic basal shoots appear 

 late in the season. 



Leaves of the basal shoots oblong to ovate, not more than 3 times as long as broad. 

 Outer sepals longer than the inner; panicle very leafy. i. L. minor. 



Outer sepals equalling or shorter than the inner. 



Pod oblong; pedicels slender, 2-4 mm. long. 2. L. racemulosa, 



Pod globose; pedicels about i mm. long. 



