188 Trans. Acad. Sci. of St. Louis. 



7. Tradescantia scopulorum Rose. 



Tradescantia scopulorum Rose, Contr.TL S.Nat. Herb, o : 205. (1899). 



Much lower and more slender than T. Virginiana, to which 

 it has been referred as an extremely narrow-leaved western 

 form. This species appears to me to be more nearly related 

 to T. occidentalism from which it differs in the slender branch- 

 ing habit, narrow glaucous leaves, more numerous umbels, 

 and in being glabrous throughout. Its range appears to be 

 from Western Texas and Arizona to Montana, east to West- 

 ern Nebraska. May to August. 



Specimens examined: Texas: Marfa Creek, Presidio 

 County, Havard 80, September, 1883 (N); Valley of the 

 Rio Grande, below Dona Ana, New Mexico, Mexican Boun- 

 dary Survey 1498 (N). New Mexico: Organ Mountains, 

 Donna Ana County, Wooton 543, September 1, 1897, speci- 

 mens with the umbels glandular-pubescent, sepals twice longer 

 and narrower, approaches T. occidentaiis, but otherwise agrees 

 with the type, but may be an undescribed species (MN). 

 Arizona: Santa Catalina Mountains, Pringle 13893, May 

 16,1881, type (M); Snowllake, Myrtle Zuck, August 4, 

 1897 (M). " 



8. Tradescantia Wrightii Rose & Bush sp. now 



Stems short, slender, simple and unbranched, 5-15 cm. tall, 

 few-leaved, glabrous and glaucous, yellowish-green; leaf- 

 blades narrowly linear, 5-10 cm. long, 1-3 mm. wide,,straight, 

 acuminate at apex, glabrous. Sheaths short, very pale, some- 

 times leafless, very smooth; bracts of the involucre 2, one 

 long and one very short, smooth. Cymes sessile, small, 

 single on the stems, few-flowered; pedicels short, apparently 

 much flattened, often much twisted, glabrous, 5-15 mm. Ions:; 

 sepals lanceolate, obtuse, 3-5 mm. long, glabrous; corolla 

 apparently very small, deep blue. — Mountains of western 

 Texas. Summer. 



Remarkably distinct from all the other species by its single, 

 simple, sessile umbel, and its simple unbranched stems. 

 Related very closely to T. pinetorum,* from which it is easily 



* Greene, Erythea. 1:247. (Dec. 1893;. 



