ORDER XVIII. CISTACEJ2. 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. AntJiers sagittate. 

 1. short. — White. If. July — Aug. Near Columbia, S. C. 

 10— "20 inches. 



2. P. asariko'lta, (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. 11. July — August. Mountains. 1 — 2 feet. 



Order XVIIL— CISTA'CE^E. 



Sepals 5, persistent, unequal, tbe 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 — o-valved, 1-celled 

 capsule, with a loculicidal dehiscence, or with the membranes 

 bearing the placentae extending nearly to the center, making it 

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

 3 to many, orthotropous. Perennial herbaceous plants. 



Genus I— HELIAX'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. II. Canaden'se, (Mich.) Stan erect, at first simple, afterward 

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

 beneath, maririns revolute. Flavors 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. If. May — June. In dry soils. Middle Geo. and 

 Car. G — IS inches. 



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

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

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

 secondary flowers mostly apetalous. Sepals villous, the two exterior 



and linear. — Yellow. %. April — May. Dry soils on the coast 

 of Car. and Geo. 10 — 15 inches. 



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



,;e, slightly denticulate, villous when young, 

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

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

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

 Petal* twice a- long as the calyx. Stamens numerous, unequal. Seed* 



