98 OPUNTIACEAE. 



and short wool. Hypanthium elongate, with spine-bearing areolae. Corolla 

 large, white, the petals, like the sepals, long and narrow. Berry spiny. 



1. A. pentagonus (L.) Britt. & Kose. Stems and branches sometimes 8 m. 

 long, the joints various, a 3-angled one often arising from a 5-angled one, 

 deep-green: spines 5-8, the radial bristle-like or subulate, brittle, the central 

 one 1-2 cm. long: corolla white, 9-12 cm. broad: fruits oval, 6-9 cm. long, 

 deep-red, spiny. [Cereus "baxaniensis Karw.] Hammocks, U. keys. [E. K.] 

 (Cuba, Ant.) 



2. HYIiOCEEEUS Britton & Eose. Plants fleshy with climbing 3-angled 

 or 3-winged stems and branches, with aerial roots, the areolae with several 

 short spines and a tuft of short wool. Flowers nocturnal, conspicuous, very 

 large. Hypanthium trumpet-shaped, with foliaceous scales, without spines or 

 wool. Sepals various, the outer ones resembling the hypanthium-scales, the 

 inner resembling the petals. Petals narrow, mostly white. Fruits fleshy, 

 globose or ovoid, with broad scales. 



1. H. tricostatus (Gosselin) Britton & Eose. Stems reclining or climbing, 

 elongate, branched, the branches often rooting at the joints, 3-angled or 3- 

 winged, the joints commonly 32 cm. long, 5-7.5 cm. broad, occasionally twisted, 

 with remote areolae: spines 3-5, rigid, blackish, 2-4 mm. long, upper ones 

 shorter than the lower: flowers white, 20 cm. broad: fruits ovoid, commonly 10 

 cm. long, scarlet. Hammocks, Key West. Nat. of Mexico. [E. K.] (Ber., 

 Cuba, Ant.) NIGHT-BLOOMING CEREUS. 



3. CEPHAIiOCEREUS Pfeiff. Plants fleshy with ribbed erect branched 

 stems, the upper areolae often developing wool. Flowers nocturnal, relatively 

 small, one from an areole. Hypanthium short, funnel-form, with few scales. 

 Sepals and petals fleshy. Ovary globular, spineless. Fruits fleshy, smooth, rela- 

 tively small, globular or depressed. Seeds reticulate, shining. 



1. O. keyensis Britton & Eose. Stem and branches erect or nearly so, becom- 

 ing 5 or 6 m. tall, glaucous, the 9 or 10 ribs separated by deep grooves : areolae 

 1-2 cm. apart, slightly elevated: spines acicular, about 15, yellow, 15 mm. long, 

 or less: flowers brownish-purple, about 6 cm. long, garlic-scented when opening 

 in the late afternoon or evening: sepals oblong-spatulate, blunt-tipped: petals 

 acutish: fruits spheroidal, about 3.5 cm. thick, reddish. Hammocks, Key West. 



4. HARRISIA Britton. Plants fleshy with cylindric stems and fluted 

 branches, the areolae bearing several slender spines. Flowers nocturnal, rela- 

 tively large, borne near the ends of the branches. Hypanthium cylindric, 

 spineless, scaly. Sepals colored. Petals white. Fruits fleshy, tubercled when 

 young, globose to ovoid, spineless, but scaly. Seeds small, often black. 



1. H. Brookii Britton. Stem and branches reclining or suberect, sometimes 

 5 m. tall, prominently 10-ribbed: areolae 2 cm. apart: spines whitish, 9-12, the 

 longer ones 2-2.5 cm. long: fruits ellipsoid, globose, or spheroidal, rounded at 

 both ends, about 8 cm. long, yellowish, the tubercles with tips about 1.5 mm. 

 high, becoming smooth. Hammocks, TJ. keys, L. keys. (Bah.) 



5. OPUNTIA [Tourn.] Mill. Plants conspicuously jointed, with sepa- 

 rated usually spine-bearing areolae. Flowers arising from the areolae. Peri- 

 anth rotate, mostly yellow or salmon. Fruits pyriform and fleshy in the follow- 

 ing species. Style cylindric. PRICKLY-PEAR. 



