60 KOCK-ROSE FAMILY. 



the bristles of the outer ,rows very slowly tura inwards, so that their glands help 

 to hold the prey ! 



D. longifolia, Longee-leaved S. In very wet bogs or shallow water, 

 with spatulate-oblong leaves, some of them erect, on long petioles. 



D. brevifolia, Short-lea ViiD S. In wet sand, only at the S.; small; 

 scape only 2' - 5' high, few-flowered ; leaves short, wedge-shaped. 

 « * Flowers rose-purple :' no blade to the leaf. 



D. fllif61ia. Thread-leaved S. In wet sandy soil near the coast, from 

 Plymouth, Mass., to Florida ; leaves erect, thread-shaped ; scape 6' - 12' high, 

 from a bulb-like base ; flowers handsome, ^' or more broad. 



2. DIOW^A, VENUS'S PLY-TRAP. (Named for the mother of Venus.) 



J], Only one species, 



D. muscipula. Grows only in sandy bogs near Wilmington, N. Car., 

 but kept in conservatories as a great curiosity. (See Lessons, p. 52, fig. 81, 

 for the leaves, and the way they catch insects !) Flowers white, borne in- an 

 umbel-like cyme on a scape 1° high, in spring. 



16. CISTACE^, ROCK-ROSE FAMILY. 



Shrubby or low herbaceous plants, with regular flowers ; a per- 

 sistent calyx of 5 sepals, two of them exterior and resembling bracts; 

 the petals and 'stamens on the receptacle; the style single or none; 

 ovary 1-celled with 3 or 5 parietal placentae (Lessons, fig. 261), 

 bearing orthotropous ovules. Represented in greenliou.?es by one 

 showy species, Cistus ladanifeeus of Europe (not common), 

 and in sandy woods and fields by the following wild plants. 



1. HELIANTHEMUM. Petals 5, crumpled in the bud, fugacious (falling at the 



close of the first day). Stamens and ovules many in the complete flower: 

 placentae 3. Style none or short. 



2. HUDSONIA. Petiils as in the last. Calyx narrow. Stamens 9-30. Style 



slender. Ovules few. 



3. LECHKA. Petals 3, persistent, not longer than the calyx. Stamens 3-12. 



Style none. Pod partly 3-celled, 6-seeded. 



1. HELIANTHEMUM, FROSTWEED. (Name from Greek words 

 for sun and flower, the blossoms opening only in snnshine. Popular name, 

 from crystals of ice shooting from the cracked bark at the root late in the 

 autumn.) Low, yellow-flowered, in sandy or gravelly soil. 2/ 



H. Canadense, Canadian or Common F. Common, and the only one 

 N. ; has lance-oblong leaves hoary beneath ; flowers produced all summer, 

 some with showy corolla 1' broad and many stamens ; others small and clus- 

 tered along the stem, with inconspicuous corolla and 3-10 stamens ; the latter 

 produce small few-seeded pods. 



H. COrymtadsum, only along the coast S., is downy all over, with smaller 

 flowers clustered at the top of the stem, and larger ones I'ong-peduncled. 



H. Carolini&,IlUm, grows only S., is hairy, with green leaves, tlie lower 

 obovate and clustered ; flowers all large-petalled and scattered, in spring. 



2. HUDSONIA. (For an English botanist, William Hudson.) Hcath-liko 

 little shrubs, 6'- 12' liigli, nearly confined to sandy shores of the ocean and 

 Great Lakes, with minute downy leaves closely covering the branches, and 

 small yellow flowers, opening in sunsliine, in spring and summer. 



H. ericoideSj Heath-like H. Greenish; leaves awl-shaped; flowers 

 pednncled. From New Jersey N. 



H. tomentdsa, Downy I-I. Hoary with soft down ; leaves oblonj; or 

 pvid and dose pressed ; peduncles short or haidly any.' From New Jersey to 

 Maine and Lake Superior. 



