476 
BOTANY. 
ABRONIA 
Most of the species of this o-onus li;ive been Imt imperfectly characterized and are not always readily 
determinable from dried speoiinens, especially if Avithont fruit. They seem to be distinguishable as 
follows. 
§ 1. Fruit coriaceous, without a rigid body, the cavity extending through the entire wing ; wings 
truncate or abruptly attenuate above. 
1. A. AKEXAiiiA, Menz. Eoot perennial ; stems procumbeut ; leaves very thick, subcordate-rounded 
or reuiform, on thick petioles; involucral leaflets rounded or ovate, herbaceous, 2-4" long; flowers 
orange-yellow, fragrant ; wings rather short, (1-2" broad,) coarsely reticulate.— On the sea-coast from 
S. California to Paget Sound. 
2. A. FRAGRANS, Xutt. Root percuuial ; stems a^iceudiug ; leaves oblong or ovate ; involucre conspic- 
uous, of broad ovate scarious leaflets ; flowers white ; fruit nearly as in the last. See page 284. 
3. A. Tri:!!ixATA, Torr. Ecsembling the last, but annual; stems decumbent or ascending; leaves 
broadly ovate or oblong ; involucral leaflets mostly narrow-lanceolate, subherbaceous ; flowers pink ; 
wings of regularly formed fruit horizoutally crested at tbe apex, narrow. See page 285, and 
Plate XXXI. 
§ 2. Body of the fruit more rigid or ligneous, the M lugs eoiL-^isting of a single lamina. 
* Wings more or less attenuate above and terminating below the apex of the fruit, cross-veined. 
4. A. rMisELLATA, Lam. Annual; stems decumbent ; leaves oblong or ovate, attenuate at base into 
a slender petiole; involucral leaflets small, lanceolate, subherbaceous, 2-3" long; flowers pink ; fruit 
mostly rigid-coriaceous, tbe wings often broad-rounded, submembranous. — From S. California to Wash- 
ington Territory, confined principally to the sea-coast. Collected by Dr. Palmer in S. Utah. See 
Plate XXXI. 
5. A. ^iKLLU !',i:a. Dougl. Leaves ovate or oblong, rounded or truncate at base ; involucral leaflets 
oblong-lanceolate, wliitc and scarious, 3-6" long ; flowers white ; fruit with the wings laterally elon- 
gated aud narrowed, 3-4" long.— Closely resembling the last. Oregon and W^ashington Territory, in the 
interior. 
* * Wings orbicular anil encircling the body, membranous and strongly reticulated. 
6. A. CYCLOPTEKA, Gray. Annual; stems ascending; leaves oblong or ovate, more or less cuneate at 
base; involucral leaflets ovate or narrow-lanceolate, 2-5" long; fruit 6-12" in diameter; seed 2^-4" 
long. See page 285. 
ERIOGONEiE. 
Condensed from the recent "'lievision of the Eriogonete," by Drs. Torrey and Gray, in Froc. Amer. 
Acad., Vol. VIIL, pp. 14.^)-200, (1870.) 
Tribe I. EUERIOGOXILE. Involucre remaining unchanged, nearly always calyx-like, rarely none. 
Leavers entire. 
* Invohiere represented by the 3-4 outer emi)ty rotinded Itracts surrounding the head of short-pedi- 
celled liractcil !io\^ ers. 
L XEMACAULIS, Xutt. A single species, N. Xuttallii, Benth., of S. California; annual; leaves 
radieal and vroolly ; Inai'ts also woolly within. 
* Involucre gamophyllous ; perigouium usually corolla-like. 
2. ERIOCONl 'M, Michx. luvoluero numy-few-flowered, its lobes pointless; pedicels exserted, 
jointed to tlie tlnwer. with slight bractlets at the liase ; achenium triaugular. 
3. ( )XYT1I1>CA, Xatt. As in tlie last, bat the 4 involucral lobes awned, its tube naked ; achenium 
leutieular. — Three speeies, ;(11 oeeurriug in Xevada. See pages 310, 311. 
4. CEXTEOSTL(iIA, tuny. Involucre 1-3-flowcred, 3-6-spurred near the base.— Two species, of S. 
California; low nearly glabrous annuals ; C. TiiCRBERi, Gray, having an involucre with 5 ovate teeth 
and 3 conical spurs, aud G. leptoceras, Gray, with a narr.iwly 6-cleft involucre and 6 l)ristle-iike spurs. 
5. CHORIZAXTHE, E. Br. Involucre 1-flowered, una])pendaged ; flower mostly included ; pedicel 
jointed, usually short or almost wanting. 
