]^20 BOTANY. 



4-5,000 feet altitude ; May-August. A very showy species, with sometimes 

 50 flowers upon a single plant; main stem erect, becoming 9" in thickness 

 and occasionally showing 25 annual rings, w.] (438.) 



Opuntia aeborescens, Eng. 3-5° high or more, with horizontal 

 branches, cylindric strongly tuberculated joints, numerous sheathed spines, 

 large purple flowers, and tuberculated unarmed fruit.— New Mexico and Ari- 

 zona, and probably farther northward. 



Opuntia acanthocaepa, Eng. & Big. Similar to the last ; rather more 

 slender and with more erect branches, smaller copper-colored flowers and 

 rather even spiny, fruit.— Arizona, and probably Southern Utah. 



Opuntia feutescens, Eng. 2-4° high, with slender terete joints 3" in 

 thickness, very small yellow flowers and scarlet berries. — From Texas to 

 Southeastern California, and probably farther northward. 



FICOIDE^. 



Sesuvium poetulacasteum, L., Var. Leaves spatulate-obovate and ob- 

 tuse, as in S. pentandrum. Florida to New Jersey. Growing in alkaline 

 soil, Truckee Meadows and at the Hot Springs near Meigs's Station, Nevada ; 

 4,500 feet altitude ; May-July. (439.) 



UMBELLIFERJE. 



Oeogenia^ lineaeifolia. Stem leafless, rising but an inch or two above 

 the ground and very slender ; leaves 2-3, upon filiform petioles, equaling the 

 stem ; leaflets 1-2' long and 1" wide, petiolulate, obtuse ; umbels with 2-3 

 rays, 1-4'' long ; umbellets 3-5-flowered ; flowers nearly sessile ; involucre 

 none ; involucels of a few (1-3) linear leaflets exceeding the rays ; fruit 

 1^2" long, oblong, subcompressed; tubers small, rounded, 3-5" in diameter. — 

 Damp shaded ridge of the Wahsatch, north of Parley's Park ; 7,500 feet alti- 

 tude; June 28, in fruit. Near to Erigenia, both in habit and characters. 

 Plate XIV. Fig. 1. Plant ; natural size. Fig. 2. Carpel ; enlarged four di- 

 ameters. Fig. 3. Cross-section of same ; enlarged eight diameters. (440.) 



•OEOGENIA. Calyx-teetli minute. Stylopodia somewhat elevated. Fruit ovoid, but slightly 

 compressed laterally and with a commissure but little narrowed ; carpels dorsally compressed, slightly 

 incurved; the 3 dorsal ribs filiform, the lateral thickened, corky and involute ; vittsB obscure, 3 in each in- 

 terval, and 2-4 in the commissure. Carpophore (?) adnate to the carpels and forming a thick corky mid- 

 rib dividing the hollowed face of the commissure longitudinally. Seed somewhat concave. — Dwarf, 

 scarcely caulescent, glabrous. Eoot tuberous. Leaves radical, 1-2-ternate ; segments entire, linear. 

 Umbel subcompound, with few very short unequal rays. 



