1036 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



the new species has not been described. Plants short-eylindric, about 

 2.5 cm. high, 2 cm. in diameter, strongly tuberculate. not ribbed; 

 spines small in diameter, unique in having a thick dense coat of hair, 

 in this respect resembling the flowering spikes of the cattail (Typha) ; 

 flowers 16 mm. long, ca.mpanula.te, the outer perianth segments broadly 

 oblong, rounded-obtuse, maroon, the inner segments narrower, sub- 

 acute, apiculate, whitish with a faint pink median strip. 



Mammillaria arizonica Engelm. Boissevain and Davidson 24 are 

 probably justified in suggesting that this species (see p. 605) is not 

 distinguished by substantial characters fromM. vimpara (Nutt.) Haw., 

 a species known to range from southern Canada to Kansas, northern 

 Texas, and southern Colorado. 



Gilia gracilis (Dougl.) Hook, (see p. 720). This plant is referred 

 by Herbert L. Mason (Madrono 6: 122-127. 1941) to the genus Phlox, 

 as P. gracilis (Dougl.) Greene. 



Phacelia laxiflora J. T. Howell, Leaflets West. Bot. 3: 95. 1941. 



A newly described species, known only from in and near the Grand 

 Canyon, Coconino and Mohave Counties. It is stated to be related to 

 P. perityloides Coville of the Death Valley region, Calif. Of the species 

 previously recorded for Arizona, P. laxiflora most nearly resembles in 

 leaf shape P. rotundifolia Torr. (see p. 733), but the plant is perennial. 



Hesperochiron pumilus (Dougl.) Porter in Hay den, U. S. Geol. Sur- 

 vey Ter. Ann. Rpt. 6: 778. 1873. 



Mormon Lake, Coconino County, in wet soil under yellow pines, 

 flowering in May (Deaver in 1941). Idaho and Washington to north- 

 ern Arizona and northern California. 



A low, acaulescent, nearly glabrous perennial herb with entire, linear 

 to obovate, long-petioled leaves in a basal rosette from a thickened 

 caudex, and rather showy flowers, these solitary on naked peduncles, 

 the corolla campanulate-rotate, lilac. Readily distinguished from all 

 other Arizona plants of the Hydrophyllaceae (see p. 728) by the ex- 

 clusively basal leaves and solitary flowers. 



LITERATURE CONSULTED 



VEGETATION OF ARIZONA 



Blumer, J. C. 



1909. ON THE PLANT GEOGRAPHY OF THE CHIRICAHUA MOUNTAINS. Sci. 



(n. s.) 30: 720-724. 

 Eastwood, Alice. 



1919. EARLY SPRING AT THE GRAND CANYON NEAR EL TOVAR. Plant World 



22: 95-99. 

 Hanson, Herbert C. 



1924. A STUDY OF THE VEGETATION OF NORTHEASTERN ARIZONA. Univ. 



Nebr. Studies 24, Nos. 3-4, pp. 85-175. 

 MacDougal, D. T. 



1908. across papagueria. Amer. Geog. Soc. Bui. 40: 1-21. 



1908. BOTANICAL FEATURES OF NORTH AMERICAN DESERTS. Carnegie Inst. 



Wash. Pub. 99, 111 pp., illus. 



1908. THE COURSE OF THE VEGETATION SEASON IN SOUTHERN ARIZONA. 



Plant World 11: 189-208; 217-231; 237-249; 261-270. 



24 Boissevain, Charles A., and Davidson, Carol. Colorado cacti. Cact. and Succ. Jour. 13, no. 4. 

 1941. Suppl.p. 65. 



