294 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



One of the results of this continued study is the addition of two new 

 species which are here described. These are accompanied by the 

 names of the species heretofore described. 



Setcreasea australis Rose, Hp. nov. 



Stems from a cluster of tuberous roots, 50 to 60 cm. high, glabrous; leaves lanceolate, 

 15 to 20 cm. long, perhaps even longer, acuminate, glabrous above, softly pubescent 

 beneath, the margin purplish and ciliate, clasping at base; flowers numerous, in both 

 axillary and terminal clusters; corolla pinkish; stamens borne on the petals; anthers 

 short and broad, the connective rather narrow; ovary glabrous. 



TypeTJ. S. National Herbarium no. 454128, collected by J. N. Rose in Tomellfn 

 Canon, Oaxaca, Mexico, September 7, 1906 (no. 11340). 



Setcreasea brevifolia (Torr.). 



Tradescantia leiandra brevifolia Torr. Bot. Mex. Bound. 22,3. 1859. 



Tradescantia speciosa Buck!. Proc. Acad. Phila. 1862: 9. 1863, not L. nor II. B. K. 



Zebrina (?) leiandra Clark in DC. Monogr. Phan. 3: 318. 1881. 



Tradescantia leiandra Wats. Proc. Amer. Acad. 18: 167. 1S83, not Torr. 



Tradescantia leiandra ovata Coulter, Contr. Nat. Herb. 1: 50. 1890. 



Tradescantia (?) brevifolia Rose, Contr. Nat. Herb. 3: 323. pi. 16. 1895. 



Treleasea brevifolia Rose, Contr. Nat. Herb. 5: 207. 1899. 



Neotreleasea brevifolia Rose, Contr. Nat. Herb. 8: 6. 1903. 



Setcreasea leiandra (Lindley). 



Tradescantia leiandra Torr. Bot. Mex. Bound. 224. 1859. 

 Treleasea leiandra Rose, Contr. Nat. Herb. 5:208. 1899. 

 Neotreleasea leiandra Rose, Contr. Nat. Herb. 8: 7. 1903. 



Setcreasea pallida Rose, sp. nov. 



Stems at first erect but soon clambering, 20 to 40 cm. long, glabrous and greenJ 

 internodes rather short; leaves oblong, 8 to 10 cm. long, trough-shaped above, pale 

 and somewhat glaucous on both surfaces, glabrous except for some cobwebby' hairs 

 along the margin, clasping at base; involucre! leaves 2 or 3, similar to the leaves but 

 shorter; umbel sessile, several-flowered; sepals 3, searious; corolla purplish white 

 funnel-shaped. 



Type U. S. National Herbarium no. 572818, collected by Dr. E. Palmer near Vic- 

 toria, Tamaulipas, Mexico, 1907, and flowered in Washington, D. ('., July, 1907. 

 Setcreasea tumida (Lindl.). 



Tradescantia tumida Lindl. Bot. Reg. 26: pi. 42. 1840. 



Tradescantia virginiana tumida Clark in DC. Monogr. Phan. 3: 291. 1881. 



Treleasea tumida Rose, Contr. Nat. Herb. 5: 208. 1899. 



Neotreleasea tumida Rose, Contr. Nat. Herb. 8: 7. 1903. 



CRASSTTLACEAE. 



Since the publication of the Crassulaceae by Britton & Rose in the 

 North American Flora in 1905, collectors in Mexico have continued 

 to send material to Washington. Not all of it has yet flowered, but 

 many specimens have done so, a considerable number of which are 

 new. Herewith are presented the descriptions of 15 new species of 

 Sedum, 1 species of Urbinia, 3 species of Echeveria, and 2 species of 

 Tilleastrum, and of 1 new genus, Graptopetalon. So far as possible 

 photographs are taken when the plants are in flower and in every 



