CISTACEiE. (rock-rose FA3IILY.) S5 



base. Style hooked at the summit. — An upriglit simple hairy percnnlai herb, 

 with numerous ovatc-lanccolate, acuminate and entire leaves, ant\ 1-3 short- 

 stalked greenish nodding flowers in cadi axil. 



1. S. COncolor, Ging. — Mountains of Carolina and northward, in deep 

 shades. June and July. (Violaeoncoior, P'ursA.) — Stem l®-2°higli. Leaves 

 short-petioled. 



Order 15. CISTACE^. (Rock-rose 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 placentas each in the middle of the valve, few oi 

 many-seeded. Seeds orthotropous. Embrjo curved, in mealy albumen 



Synopsis. 



1. IIELIANTIIEMUM. Style none. Stigma capitate. Embryo nearly annular. 



2. LECUKA. Sty e none. Stigmas plumose. Embryo nearly straight. 



3. IIUD.ONIA Style filiform Stigma minute. Embryo coiled. 



1. HELIANTHEMUM, Tuum. Rock-rose. 



Petals 5, corrugated in the bud, sometimes wanting. Stigma sessile or nearly 

 so, capitate, 3-lobed. Capsule 3-vaIved. Embryo curved nearly into a ring. — 

 Low herbs or partly shrubby plants, with fugacious yellow flowers. 



* Flowers perfect : petals conspicuous : stamens IndejinUe : capsule many-speded. 



1 . H. Carolinianum, Michx. Hirsute ; leaves lanceolate, denticulate, 

 acute, short-pctioled, the lowest obovate, crowded ; flowers large, solitary, borne 

 above the axils. — Dry sandy soil, Florida to North Carolina and westward. 

 March and April. — Stems G'-12' high, ascending from a shrubby base. 

 Flowers 1' wide. 



2. H. arenicola, sp. n. Iloary ; leaves small, lanceolate, obtuse, entire, 

 with the sides rcvolute ; flowers solitary, or 2-4 in terminal umbellate clusters, 

 on slender pedicels. — Drifting sands near the coast. West Florida. March and 

 April. — Stems shmbby and branched at the base, all but the short (2' -6') 

 flowering stems buried in the sand. Flowers ^' wide. 



* * Flowers of two kinds: the earliest as in the last section, the later ones smaller, 

 clustered, with small petals, or none, fewer stamens, and few-setdtd capsules 



3. H. COrymbosuin, Michx. Tomentose, stems erect, shrubby at the 

 base ; leaves lanceolate, obtuse, entire, hoary beneath, with the sides revoliue ; 

 flowers nearl}' sessile in a cymose cluster at the summit of the stem, the perfect 

 ones long-pcduncled ; sepals woolly. — Dry sands near the coast, Florida to 

 North Carolina. April. — Stems 1° high. Capsule smootii. 



