32 
the inner ones broadly obovate or orbicular-obovate, undulate, 
scarcely, if at all, mucronate: berries obovoid, 4-6 cm. long, 
purple: seeds numerous. [Plate 225. 
Hammocks, Florida Keys and the Cape Sable region.—T ype 
specimens collected on Boot Key, April, 1909, by N. L. Britton 
in the herbarium of the New York Botanical Garden. 
Our two typically maritime species of Opuntia were recorded 
for many years under names that did not belong to them, as far 
as the plants growing in Florida were concerned. 
This plant is strictly maritime, and has only been found on 
the Florida Keys and on the shores of the Cape Sable region 
It has been confused with several species described long ago, but 
recent observation both in the field and on plants grown in the 
garden at Buena Vista have convinced me of its valid claim to 
specific recognition. It differs from its relative, Opuntia Dillenit, 
both in vegetative and floral characters. Casual observation 
would determine it as unarmed; but careful examination will 
disclose it to be in a wav our most thoroughly armed kind. The 
spines are short and stout, so short that they seldom protrude 
beyond the bristles of the areolae. However, they are often 
numerous and exist in clusters of as many as thirteen. The 
flower is unique among the Florida species of Opuntia. The 
corolla instead of being rotate is short-campanulate or cup- 
shaped. The plants produce flowers and fruits much more 
sparingly than those of Opuntia Dillenii. 
This species is evidently the Opuntia Ficus-indica of Chap- 
man’s “Flora,” and it was described under Opuntia inermis in 
the second edition of my ‘‘Flora.”’ 
7. Opuntia Ditteni (Ker) Haw. Suppl. Pl. Succ. 
79. I81I9 
Cactus Dillenti Ker, Bot. Reg. 3: under pi. 255. 1818. 
Plant erect, rather strict, sparingly branched and much- 
branched and sometimes diffuse or sometimes 2 m. tall, occa- 
sionally somewhat tree-like, with stout fibrous roots: joints 
elliptic to obovate or oval, thickish, 1-3 dm. long, light-green. 
often glaucous: leaves ovoid, 2-5 mm. long, usually green: 
areolae remote but conspicuous, mostly armed: spines stoutish, 
clustered, usually 3-6 together, flattened, often curved, pale- 
