120 
BOTANY. 
4-5,000 feet altitude ; May-August. A very sliowy species, with suuietimes 
50 flowers upon a single jdant ; main stem erect, becoming 0" in thickness 
and occasionally showing 25 annual rings, w.] (438.) 
Opuntia aeborescens, Eng. 3-5"^ higli or more, with horizontal 
branches, cylindric strongly tuberculated joints, numerous sheathed spines, 
large purple flow^ers, and tuberculated unarmed fruit. — New Mexico and Ari- 
zona, and prol)ably fartlier 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 frutescens, Eng. 2-4° high, with slender terete joints 3" in 
thickness, very small yellow flow^ers and scarlet berries. — From Texas to 
Southeastern California, and jn'obably farther northward. 
FICOIDE^. 
Sesuvium poetulacasteum, L., Var. Leaves spatulate-obovate and ob- 
tuse, as in ^. peMtandrum. Florida to New Jersey. Growing in alkaliiie 
soil, Truckee Meadow^s and at the Hot Springs near Meigs's Station, Nevada ; 
4,500 feet altitude ; May-July. (439.) 
UMBELLIFER^. 
Orogenia^ linearifolia. Stem leafless, rising but an inch or two above 
the ground and very slender ; leaves 2-3, upon filiform petioles, equaHng 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) hnear 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. Cai-pel ; enlarged four di- 
ameters. Fig. 3. Cross-section of same ; enlarged eight diameters. (440.) 
iQEOGENIA. Calyx-trerli miimr.'. Stylopodia sojiii wliat elevated. Fruit ovoid, but slightly 
compressed laterally and with a eomini.ssun^ l.ut little narrowed; carpels dorsally eouipres.sed, slightly 
iucwrved; tlio 3 dorsal rib^s filifonii, tlie lateral thickened, eorky and involute; vitt;e obscure, 3 in each in- 
terval, and 2-4 in the conuui^.snre. Carpophore (?) adnate to the carpels and forming a thick corky mid- 
rib dividing the hollowed face of the conmiissuro longitudinally. Seed somewhat concave.— Dwarf 
scarcely caulesce nt, glabrous. Root tuberous. Leaves radical, 1-2-ternate ; segments entire, linear! 
Umbel subcompouud, with few very short unequal rays. 
