COLLECTED DESCRIPTIONS OF AGAVE. $25 
AGAVE HETERACANTHA (Zucc.), FoRMA GLOMERULIFLORA.— The investigations of Dr. V. Havard of the [48] 
medical service of the U. S. Army have brought out some interesting morphological facts in regard to this spe- 
cies, which may teach us a lesson about the variability of characters taken from the inflorescence of Agaves. The 
species (or the form which is known as A. Poselgeri), is abundant in the mountain regions of West Texas and along the 
—_7 \ 
Fic. 6. — CApsuLES oF AGAVE. 
Rio Grande betweeen El Paso and Presidio, and has there usually narrow leaves ? to 14 inch wide, and a foot or less 
long, and an inflorescence of geminate flowers, but occasionally some more vigorous specimens are found with much 
larger leaves over 2 inches wide ; others bear the flowers in clusters instead of pairs, three to six, and even ten, in num- e 
ber, on stout, flattened peduncles, 4 to 3 inch long, which seem to form an approach to the paniculate character. The 
figure (fig, 6) represents a cluster of ten capsules, mostly denuded of the remnants of the flowers, and the diagram shows 
their arrangement. — [Jan. 13, 1883, n.s., vol. xix. 
