CISTACEJE. (ROCK-ROSE FAMILY.) 35 
base. Style hooked at the summit. — An upright simple hairy perennial herb, 
with numerous ovate-lanceolate, acuminate and entire leaves, and 1—3 short- 
stalked greenish nodding flowers in each axil. 
1. S. concolor, Ging. — Mountains of Carolina and northward, in deep 
shades. June and July. (Viola concolor, Pursh.) — Stem 19°- 2° high. Leaves 
-short-petioled. 
Orprr 15. CISTACEJE. (Rocx-nosE FAMILY.) 
Herbs or low shrubs, with entire leaves, and regular mostly polyandrous 
flowers. — Sepals 5, persistent, the two outer ones smaller, the three inner 
twisted in the bud. Petals mostly 5, twisted contrary to the sepals in the 
bud, rarely wanting. Stamens few or numerous, distinct, hypogynous. 
Anthers innate. Ovary 1-celled. Style single. Capsules 3—5-valved, 
bearing as many parietal placentæ each in the middle of the valve, few or 
many-seeded. Seeds orthotropous. Embryo curved, in mealy albumen. 
Synopsis. ^ 
1. HELIANTHEMUM. Style none. Stigma capitate. Embryo nearly annular. 
2. LECHEA. Sty'e none. Stigmas plumose. paese Oar 
3. HUDSONIA. ‘Style filiform _ neatis Nero ener : 
Petals 5, corrugated in the bud, sometimes wanting. Stigma sessile or nearly 
so, capitate, 3-lobed. Capsule 3-valved. Embryo curved nearly into a ring. — 
Low herbs or partly shrubby plants, with fugacious yellow flowers. 
* Flowers perfect : petals conspicuous : stamens indefinite : capsule many-seeded. 
1. H. Carolinianum, Michx. Hirsute; leaves lanceolate, denticulate, 
acute, short-petioled, the lowest obovate, crowded ; flowers large, solitary, borne 
above the axils. — Dry sandy soil, Florida to North Carolina and westward. 
March and April.— Stems 6'-12/ high, ascending from a shrubby base. 
Flowers 1! wide. 
2. H. arenicola, sp. n. Hoary; leaves small, lanceolate, obtuse, entire, 
with the sides rétéfüis; flowers solitary, or 2-4 in terminal umbellate clusters, 
on slender pedicels. — Drifting sands near the coast, West Florida. March and 
April.— Stems shrubby and branched at the base, all but the short (2! 6/) 
flowering stems buried in the sand. Flowers j' wide. - 
* * Flowers of two kinds: the earliest as in Hie Datel IN Loic" ome iali 
clustered, with small petals, or none, fewer stamens, and few-seeded capsules. a 
3. A. corymbosum, Michx. Tomentose, stems erect, shrubby at the 
base ; leaves lanceolate, obtuse, entire, hoary beneath, with the sides revolute ; 
fent arn eria in sero tempi oni o ins 
