164 MISSOURI BOTAMCAL GARDEN. 



geners, the deep green glossy leaf-surface acquiring a 

 glaucous tint from the sparse scales. The whitish flower 

 stalk is about equal in length to the leaves, and sheathed at 

 intervals of about an inch by closely appressed bracts of a 

 deep green. The panicle is about as long as the scape, 

 with ascending branches a span long, the rachis flattened 

 above each axil, and the subtending bract wrapped about 

 the branch. The calyx is deep green, and each is closely 

 encircled by a glossy bract of nearly equal length and 

 similar color, just about equaling the pale internode. The 

 expanded corolla is about double the length of the calyx, 

 white with a slight crcaminess, and somewhat waxen in 

 appearance, cylindrical with perfectly erect lobes, opening 

 only for a short distance on one side to form a slit through 

 which the straight white filaments with yellow anthers and 



of an inch. 



green stigma 



Explanation of plate 31. Fig. 1, flowering plant of Tillandsia utri- 



culata, one-sixth natural size ; flg. 2, branch of panicle, natural size ; fig. 



3, flower, X 2; flg. 4, flower with calyx opened, natural size; flg. 5, 



petal, natural size ; flg. 6, cross-section of ovary, X 10 ; Ag- 7, stigmas, 

 X3. 



6. AGAVE PARVIFLORA TORRE Y.* 



This charming little Agave, the smallest of the genus, 

 was collected on the original Mexican boundary survey, by 

 Dr. Schott, in the Sierras of southern Arizona, and char- 

 acterized by Professor Torrey in the Botany of the Boundary 

 Survey. Since that time, so far as I can learn, it has not 

 been collected, although what purports to be this species is 

 in cultivation in Europe; and the only material in the 

 Engelmann herbarium is a portion of the original Schott 

 specimen. In the latter part of July, 1892, Professor 



* Bot. Mex. Bound. 214; Engelmann, Transactions St. Louis Academy, 

 iii. 300, and Collected Writings, 307; Baker, Gardeners' Chronicle, 1877, 

 n. s. vii. 303, and Amaryllideae, 166; Hemsley, Biologia Cent. Amer. 

 iii. 347. 



