ROCK=ROSE FAMILY. Cistacex. 



ROCK-ROSE FAMILY. Cistacece. 



Small shrubs or herbs with regular flowers, the five 

 green sepals of unequal size, the two outer smaller ones 

 resembling bracts, or small leaflets. Petals 3-5. But 

 one style or none at all. Seed-receptacles (on slender 

 stalks) opening at the top. Visited by butterflies and 

 honeybees in particular. 



Frostweed &* perennial, remarkable for the fact 



Helianthemum that ice-crystals form about the cracked 

 Canadense bark of the root in late autumn. Lance- 



oblong dull green leaves hoary with fine 

 June-August 



hairs on the under side. With two kinds 



of flowers, the early ones solitary, one inch broad, with 

 showy yellow petals which are more or less crumpled in 

 the bud, which fade early and fall away ; these early 

 blossoms have innumerable stamens. The later ones 

 have few, and are small and clustered at the bases of the 

 leaves. Pods of the larger flower inch long ; of the 

 smaller one, not larger than a pin head. Low. In sandy 

 soil from Me., south, and west to Minn. The name 

 from the Greek words sun and flower ; the flowers open 

 only once in sunshine. 



Hudsonia A bushy little shrub with tiny awl- 



tomentosa shaped, scalelike leaves, oval or longer, 



Yellow downy, and set close to the plant-stem. 



May-June The sma u yellow flowers crowded along 

 the upper branches ; they open only in sunshine. The 

 stem 5-10 inches high, hoary with down. Sandy shores 

 Me. to Md., and along the Great Lakes to Minn. Also 

 on the sandy beaches of Lake Charnplain, Burlington 

 and Apple Tree Bays. 



An insignificant, fine-hairy, perennial 

 herb ' with tin ^ lin ear leaves, larger on the 



minor 



Greenish or upper parts of the plant, and very small 

 magenta=tinted near the base. The three tiny, greenish 

 (or magenta- tinted), narrow petals remain 

 within the green sepals after fading. The 

 pod nearly globose, and appearing like a pin head. The 

 upright smooth (when old) stem 10-18 inches high, 

 Common in dry, sterile ground. 

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