678 



ClSTACEAE 



Heli anthem um 



50 



Map 1423 



Helianthemum canadense (L.) Michx 



193. ClSTACEAE Lindl. Rockrose Family 



Petals 5, yellow, fugacious, or lacking. 



Leaves lanceolate, oblong, or oblanceolate ; styles short 



5245. Helianthemum, p. 678. 



Leaves subulate or scalelike; styles long 5247. Hudsonia, p. 679. 



Petals 3, not yellow, persistent; styles none 5248. Lechea, p. 679. 



5245. HELIANTHEMUM [Tourn.] Mill. Rockrose 



Petaliferous flowers bright yellow, solitary or rarely 2, 2-4 cm wide, their capsules 

 6-9 mm in diameter, flowering usually in early June and soon much overtopped by 

 the branches and becoming lateral, the outer 2 sepals much shorter than the inner, 

 or wanting; capsules of the apetalous flowers of two sizes, the terminal ones 3-4 



mm in diameter and the lateral ones much smaller; seed papillose 



1. H . canadense. 



Petaliferous flowers pale yellow, 5-12 in a short terminal cymose raceme, 1.5-2.5 cm 

 wide, flowering the last of June or in July, the outer 2 sepals as long as or nearly 

 as long as the inner ones, their capsules 3-5 mm in diameter, these flowers rarely 

 overtopped by the later branches; capsules of the apetalous flowers not of two 

 kinds, about 2 mm in diameter; seed reticulate 2. H. Bicknellii. 



1. Helianthemum canadense (L.) Michx. (Crocanthemum canadense 

 (L.) Britt.) Map 1423. Generally in open black and white or black oak 

 woods and usually in very dry sandy soil or rarely in dry gravelly soil. 

 Infrequent. 



Maine to Wis., southw. to N. C. and Miss. 



2. Helianthemum Bicknellii Fern. (Rhodora 21 : 36-37. 1919.) (Heli- 

 anthemum majus BSP., Helianthemum Walkerae (Evans) Lyon, and 

 Crocanthemum majus (L.) Britt.) Map 1424. In habitats and soils 

 similar to those of the preceding species but much less frequent. 



N. S. to Minn., southw. to S. C, Tex., and Colo. 



