SCIENTIFIC AND POPULAR. 189» 



995. HETERODRABA, Greene. Heterodraba. Cruciferae^ 



From Greek, a "different Draba". Slender diffuee annuaL 

 One species, Pacific coast of U. S. 



996. HETEROGAl^RA, Rothr. Heterogaura. Onagraceae. 



From Greek, a "different Gaura". Annual herb with habit 

 of Clarkia. One species, California. 



997. HELEROMELES, Roemer. California Holly. Pomaceae. 

 From Greek, a ' different Medlar". Syn. Photinia, Crataegus^ 



Mespilus, in part. A small evergreen tree, bearing ample 

 clusters of red berries. One species; (a) H. arblitifolia (H. 

 Ait. f. )Roem. (C. arbutifolia Ait. not Poir., P. arbutifolia Lind.. 

 (Kew), M. arbutifolia Link., H. Fremontiana Decne. ). 

 California Holly, California Christmas-berry, Laurel Hawthorn,, 

 Toyon, ToUon. 



998. HETEROSPERMUM, Cav. (Heterosperma). Compositae. 



From Greek, with "dissimilar seeds". Annual herbs with 

 small heads of yellow flowers. About 7 species, Mexico to S. 

 America; 1 in southern U. S. 



999. HETEROTHECA, Cass. Heterotheca. Compositae. 



From Greek, with "dissimilar cases", alluding to achenes. 

 Herbs with rather large flower heads (yellow). About 6 spe- 

 cies, Mexico and northward; 2 in U. S. 



1000. HEtCHERA, L. Alum-root, etc. Saxifragaceae. 



Named for Prof. J. H. von Heucher, German botanist, d. 

 1747. Perennial herbs, leaves mostly basal. About 20 species, 

 N. America; 17 in U. S. mostly southwestern. 



a. H. Americana L. Ontario to Alabama, west to Louisiana and 

 Minnesota. Alum-root, Common Alum-root, American Sanicle^ 

 Split-rock, Cliff-weed. Root of this and other species astrin- 

 gent. The names American Sanicle and Ground Maple apply 

 especially to (b) H. yillosa Michx., Virginia to Tennessee. 



1001. HEVEA, Aubl. Brasilian Rubber tree. Euphorbiaceae. 



From vernacular, heve, S. America. Syn. Siphonia, Rich.,, 

 also Jatropha, in part. Trees. About 12 species, tropical S. 

 America. 



a. H. Ouianeiisis Aublet. (S. Guyanensis Juss., S. elastica Pers., 

 J. elastica L. f. ). Source of Para rubber. Prepared milk-juice 

 (of this and other species); 1 lastica, U. S. P., India-rubber,. 

 Caoutchouc (Caut>chuc), Resina elastica, Gummi elasti'um; 

 Ger. Kautschuk, Federharz; Fr. Caoutchouc (Codex); Sp. 

 Cahuchu, Goma elastica. Brasilian rubber is obtained also- 

 from (b) H, Brasiiiensis Muell. (S. Brasiliensis Kunth. ) and 

 from (c) H. discolor Muell. From the seeds of (b) is obtained 

 Siringa oil, used for making soap. 



1002. HEXALECTRIS, Raf. Crested Coral-root. Orcliidaceae. 



From Greek, "six «• rested". Syn. Bletia, in part. Teres- 

 trial orchid with coralloid roots. One species, N. Carolina to- 

 Florida and Mexico. 



