168 MISSOURI BOTANICAL GARDEN. 
one-fourth natural size; apex and marginal teeth, natural size; young 
(functionally staminate) and old (functionally pistillate) flowers, natural 
size; capsules (rather smaller that usual), natural size; seed from side 
and edge, and in section, x 2. 
Agave Hngelmanni belongs to the foliage group Rigida, 
but has rather more flexible leaves than are common in 
that group; and in the absence of floral characters would 
be placed beside or united with A. densiflora or the scarcely 
distinct A. polyacantha. That species, however, isa typical 
but very densely flowered representative of the group Lit- 
tea,— the Geminiflore of Engelmann. A. Engelmann, on 
the other hand, though it possesses the oblong inflorescence 
of that group, has its flowers aggregated in unmistakable 
clusters for the most part elevated on well marked common 
peduncles, so that it must be classed with the species con- 
stituting the group Huagave,— the Paniculate of Engel- 
mann,— which, to a certain extent, it thus brings into 
connection with Littwa. The latter, moreover, occasionally 
has the lowest flowers in sessile groups of three, while Engel- 
mann describes in the Gardeners’ Chronicle for 1883, xix, 
48, a form of A. heteracantha with the capsules clustered 
on very evident common peduncles. 
At present no light can be thrown on the origin of this 
species, which, as has been said, is in no sense related to 
A. attenuata. The only reference I find to a variety sub- 
dentata under the latter, is in the catalogue of Cels of Paris, 
for 1865, p. 17. Possibly the seedling here described 
may have originally come from that house. 
me XL, 
