60 ROCK-ROSE FAMILY. 



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

 to hold the prey ! 



D. longifdlia, Longer-leaved S. In very wet bogs or shallow water, 

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



D. brevifdlia, Short-leaved 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. filifolia, 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-Hke base ; flowers handsome, j' or more broad. 



2. DIONJEA, VENUS'S FLY-TKAP. (Named for the mother of Venus.) 



2/ 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 placent:e (Lessons, fig. 261), 

 bearing orthotropous ovules. Represented in greenhouses by one 

 showy species, Cistds ladaniferus 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). Stiunens and ovules many in the complete flower: 

 placentae 3. Stvle none or short. 



2. HUDSONIA. Petals as iu tlie last. Calyx narrow. Stamens 9-30. Style 



slender. Ovules few. 

 J 3. LECHEA. 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 sunshine. Popular name, 

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

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



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

 N. ; has lance-oblong leaves hoary beneath ; flowers produced all sumnH'r, 

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

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

 px'odnce small few-seeded pods. 



H. eorymb6sum, only along the coast S., is downy all over, witli smaller 

 flowers clustered at the top of the stem, and larger ones long-peduncled. 



H. Carolinianum, grows only S., is hairy, with green leaves, the lower 

 obovatc and clustered ; flo\vers all large-petalled and scattered, in spring. 



2. HUDSONIA. (For an English botanist, William Hudson.) Heath-like 

 little shrubs, 6'- 12' liigh, 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 sunshine, in spring iind summer. 



H. ericoides, Heath-like H. Greenish; leaves awl-shaped; flowers 

 pcdunck'd. From New -Jersey N. 



H. tomentdsa, Downy H. Hoary with soft down ; leaves oblong or 

 oval and close jjressed ; ])edu.nclcs short or liardly any. From New Jersey to 

 Maine and Lake Superior. 



