CISTACE.E. (ROCK-ROSE FAMILY.) 35 



15. V. striata, Ait. Stems ascending; leaves cordate, serrate, roughened 

 as in No. 12, the uppermost often acute; stipules large ; spur thick, shorter 

 than the large cream-colored petals ; lateral petals boarded, the lower striped 

 with purple. Mountains of Georgia and Tennessee. April. Stems 10' - 12' 

 high. Peduncles elongated. 



16. V. Canadensis, L. Tall; leaves large, broadly cordate, acuminate, 

 coarsely serrate, longer than the peduncles ; stipules nearly entire ; spur very 

 short ; petals white, externally purplish, the lateral ones bearded. Kich soil 

 along the mountains. May- August. Steins 1 - 2 high. 



3. Stems leaf y ; root annual. 



17. V. tricolor, L., var. arvensis, DC. Stems branching; lowest 

 leaves roundish, the upper lanceolate, entire; stipules leafy, pinnatih'd ; 

 flowers small, yellow and purple. Open woods and waste places, perhaps 

 indigenous. Stem 6' high. 



2. SOLEA, Ging. 



Sepals not produced at the base. Petals unequal, the lowest one gibbous 

 at the base and 2-lobed at the apex, the others smaller. Stamens with the 

 filaments united and produced above the anthers, the two lower ones glandu- 

 lar at the 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. Rich soil in the upper districts, in deep shades'. 

 June - July. Stem 1 - 2 high. Leaves short-petioled. 



OKDER 14. CISTACE^E. (ROCK-ROSE FAMILY.) 



Herbs or low shrubs, with entire leaves, and regular mostly poly- 

 androns 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 placentae each in the 

 middle of the valve, few- or many-seeded. Seeds orthotropous. Em- 

 bryo curved, in mealy albumen. 



Synopsis. 



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



2. LECHEA. Style none. Stigmas plumose. Embryo nearly straight. 



3. HUDSONIA. Style filiform. Stigma minute. Embryo coiled. 



1. HELIANTHEMUM, Tourn. ROCK-ROSE. 



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. 



