ORDER XVIII. CISTACEJB. 237 



Petals oval or ovate, with 5 — 7 green nerves. Sterile filaments in 5 

 bunches, each composed of 3 filaments, distinct nearly to the base, about 

 the length of the stamens, terminated by an awn. Anthers sagittate. 

 Styles 4, short. — White. U- July — Aug. Near Columbia, S. C. 

 10—20 inches. 



2. P. asauifo'lia, (Vent.) Leaves reniform, the cauline one nearly 

 orbicular, slightly cordate, sessile. Petals ovate, broad, obtuse, un- 

 guiculate ; sterile filaments separate nearly to the base, united by 

 threes. Leaves and flowers larger than in the preceding species. — 

 White. 2£. July — August. Mountains. 1 — 2 feet. 



Order XVIIL— CISTA'CE^E. 



Sejjals 5, persistent, unequal, the outer smallest or wanting, 

 the 3 inner with an imbricate and sometimes twisted aestiva- 

 tion. Petals 5, hypogynous, fugitive, twisted in an opposite 

 direction from the sepals. Stamens indefinite, hypogynous, 

 distinct. Anthers short, innate. Ovary 3 — 5-valved, 1-celled 

 capsule, with a loculicidal dehiscence, or with the membranes 

 bearing the placentas extending nearly to the center, making it 

 imperfectly 3-celled, and in the Leehea called 3-celled. Seeds 

 3 to many, orthotropous. Perennial herbaceous plants. 



Genus L— HELIAN'THEMUM. Tourn. 12—1. 



(From helios the sun, and anthos, a flower ; because the flower opens with the rising 

 of the sun.) 



Sepals 5, unequal, the two exterior small, bract-like, and 

 sometimes wanting. Petals 5, fugitive, or occasionally want- 

 ing. Stigmas 3, large, more or less united into one. Capsule 

 3-valved, few or many seeded, triangular. Sun-rose. 



1. H. Canaden'se, (Mich.) Stem erect, at first simple, afterward 

 branched, branches hairy. Leaves oblong-lanceolate, acute, hairy, pale 

 beneath, margins revolute. Flowers of the stem few or solitary, termi- 

 nal, large; of the branches axillary, small, nearly sessile, with very 

 small or no petals. Petals erosely emarginate, double the length of the 

 sepals. — Yellow. U- Ma}' — June. In dry soils. Middle Geo. and 

 Car. 6—18 inches. 



2. H. corymbo'sum, (Mich.) Stem branching, covered with stellular 

 pubescence. Leaves oblong-lanceolate, canescent beneath. Flowers in 

 terminal, corymbose cymes. Petals twice the length of the calyx; 

 secondary flowers mostly apetalous. Sepals villous, the two exterior 

 long and linear. — Yellow, if. April — May. Dry soils on the coast 

 of Car. and Geo. 10 — 15 inches. 



3. H. Carolinia'num, (Mich.) Stem erect, hirsute, generally purple. 

 Leaves nearly sessile, obovate, slightly denticulate, villous when young, 

 crowded near the base of the stem, sometimes nearly orbicular. Flow 

 era near the summit of the stem, few, large. Sepals, the two exterior 

 linear, expanding; the three interior larger, ovate-lanceolate, acuminate. 

 Petals twice as long as the calyx. Stamens numerous, unequal. Seeds 



