60 ROCK-ROSE FAMILY. 



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

 to luilil the ]irev ! 

 D. longifolia, LON<;I;K-I.I.AVI.I. S. In very wet bogs or shallow -water, 



with spatnlate-ohloiig leaves, .-omc of them erect, cm Ion-- petioles. 



D. brevifdlia, SHORT-LEAVED S. In wet >and, only at the S. ; small; 

 scape only 2' - 5' high, few-flowered ; leave- >hort, wedge-shaped. 

 # * F/oiri'fft nisi -/nir/ili' : nn It/tide to the leaf. 



D. fllif61ia, TIIRKAL-LKAVI i. S. In wet sandy soil near the coast, from 

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

 from a Imlb-likc base ; flowers handsome, ' or more broad. 



2. DION-3EA, VKNUS'S FLY-TRAP. (Named for the mother of Venus. J 



2/ Only one species, 



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

 Ynit kept in conservatories as a great eurioMty. (See Lessons, p. 65, fig. 176, 

 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.S], 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 placenta- (Lessons, fig. 334), 

 bearing orthotropous ovules. Represented in greenhouses by one 

 showy species, CISTDS LADAXII Kitrs of Europe (not common), 

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



1. HF.LIAXTllKMrM. Petals 5, crumpled in the bud, fugacious (falling nt the 



close of the lir-t day). Stamens and ovules many in the complete flower: 

 placentae 3. Style none or short. 



2. HUDSONIA. Petals 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, FROSTWEKD. (Name from Greek words 



for ami and //.<>;, the blossoms opening only in sunshine. Popular name, 

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

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



H. Canadense, r.w\m\\ or COMMON F. Common, and the only one 



N. ; has lance-oblong leaves lioarv beneath; (lowers produced all summer, 

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

 tered aloir_ r the stem, with incon-picuuits corolla and 3- 10 stamens,; the latter 

 produce Mnall Few-seeded pods. 



H. COrymb6sum, only along the coast S., is downy all over, with smallei 

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



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

 obovate and eln.-tered ; flowers all largc-petalled and scattered, in spring. 



2. HUDSONIA. (For an Kn-li.-h botanist, \\'il/i,im Ifmlson.) Heath-like 

 little shrubs, ('/- 1:2' high, nearly conlined to >andy shores of the ocean and 

 (ireat Lakes, with minute downy leaves c!n-il\ covering the branches, and 

 small yellow flowers, opening in -nnshine, in spring and summer. 



H. ericoides, UKATII-I.IKK II. Greenish; leaves awl-shaped; flowers 

 pcdiineled. From New ,)er>cy N. 



H. tomentbsa, DOWNY II. Hoary with soft down ; leaves oblong or 

 oval and close pressed; peduncles short or hardly any. From New Jersey to 

 Maine and Lake Superior. 



