CISTACEJE. (ROCK-ROSE FAMILY.) 
47 
Order 16. CIST ACE JE. (Rock-rose Family.) 
Herbs or low shrubs , with regular flowers , distinct hypo - 
gynous stamens, a \-celled 3 - 5 -valued pod with as many 
parietal placenta borne on the middle of the valves , and 
orthotropous albuminous seeds. — Sepals 5, persistent; the 
2 external small like bracts, sometimes wanting; the 3 
others a little twisted in the bud. Petals 3 or 5, usually fu¬ 
gacious, convolute in the opposite direction from the calyx 
in the bud. Stamens few or many. Style single or none. 
Ovules few or many, on slender stalks, with the orifice at 
the apex. Embryo slender, straightish or curved, in mealy 
albumen. — Leaves simple and mostly entire, the lower 
usually opposite, and the upper alternate. Root perennial. 
Synopsis, 
1. Helianthemcm. Petals 5, crumpled in the bud, fugacious. Sta- 
'"™“ od ovules numerous in the conspicuous petal-bearing 
2. Hcdsosia. Petals 5, fugacious. Stamens 9-20. Style slender. 
Pod strictly 1-celled, about 3-seeded. 
. ec he a. Petals 3, rather persistent. Stamens 3-12. Style 
iS - ’* imperfect partitions 
1. HELlilKTHEMtM, Toum. Rock-rose. 
sticma 3 M?" bU<1 ’ fu S acious ‘ Style short or none: 
IT,ter ? n aPSU StnCtly 1 - C6l,ed - Embr y° curved like 
ZJZ m most N - American s P ecies two 
sorts, uz., 1. the primary, or earliest ones, with large petals 
numerous stamens, and many-seeded pods : 2. secondary, or later 
(or noneW 7 SInalle r and in clusters, with small petals 
Se ven! 7 StameDS ’ and much smaller 3-few-seeded pods. 
p! yellow flowers open m sunshine, and cast their petals by the 
1 wT Name fr ° m ’ X ‘° S ’ the *“*» a " d Mspov, flower.) 
w hX ' a (FROS —) PetaUearin, 
leaves, neariy^sSe C 1L ‘** the 
the small hoary liketh* '? ar ^ e flowers hairy-pubescent; of 
leayes. r ' OWer side of the lanceolate-ob.ong 
A variety is more hoary, and with a stronger tendency 
