ENGELMANN — XOTES ON AGAVE. 309 



III. Paniculate. 



Flores ad apices ramorum inilorescentias congesti paniculati. 



These are the typical Agaves, of which 20 or more forms are 



enumerated, with stout, often very large, fleshy leaves, almost 



always with spiny marginal teeth and strong spiny tips, a stout 



and high scape bearing a paniculate inflorescence, the branches 



of which are usually \-2 feet long or even more, stout, vertically 



compressed, and naked up to the base of the branchlets or pedun 



cles. Most of them are stemless, some have trunks several feet 



high, but none grow as large as some Yuccas do. Among them 



we find the economically and commercially most important 



Agaves, especially A. Americana and A. rigida. 



* Tubus perianthii lobis multeities brevior. 



■f Stamina tubi bast inserta. 



9. Agave Newberryi, n. sp. : acaulis ; foliis e basi latiore 

 sensim angustatis lanceolato-linearibus rigidis integris apice acu- 

 leo fusco semitereti supra canaliculato armatis ; scapo gracili, 

 paniculae angustaj racemiformis ramulis remotis bracteis lanceo- 

 latis breviusculis fultis abbreviatis paucifloris ; perigonii tubo 

 campanulato brevissimo, lobis oblongis, staminibus infimo tubo 

 adnatis. — Agave, n. spJ Torrey in Bot. Ives Exp. p. 29. 



Peacock Spring, Northwestern Arizona, west of the San Fran- 

 cisco Mountains, between them and the Colorado River, over 

 4,000 feet alt., discovered, when just beginning to bloom, March 

 31, 1S58, by Dr. J. S. Newberry on Lieut. Ives' Expedition, and 

 named for him in commemoration of his services to Botany in 

 this and other western explorations. — This very peculiar plant, 

 of which we unfortunately know so little, is so different from the 

 other paniculate Agaves known to me, that their connection 

 seems to be altogether artificial ; but for the present I can not 

 do better than to place it between them and the last section, 

 to which the small stature and the form of the leaves seem to 

 approximate it, though the inflorescence is clearly a contracted, 

 short-branched panicle. 



Leaves 7-10 inches long, at base | inch wide, with entire, car- 

 tilaginous margins,* terminating in a sharp, semi-terete or almost 



* Possibly a horny tooth-bearing edge, such as we find in A.heteracantha, may have 

 broken oft", but no traces of such remain in the only extant specimen. 



