353 
“Fruit coriaceous, without a rigid body, the cavity extending through the entire wing: wings 
truncate or abruptly attenuate abore. 
lL. A. fragrans Nutt. Root perennial: stems ascending: leaves oblong or ovate: 
involucral bracts large, broadly ovate, white and scarious: flowers white: fruit not 
trested.—On sahdy hills from the Rio Grande to the plains west of the Pecos. April 
to Atigust, 
2, A. turbinata Torr. Resembling the last, but annual: stems decumbent of 
ascenditig, 1 to 8dm. high: leaves broadly ovate or oblong: involucral bracts mostly 
hatrowly lanceolate, subherbaceous, 4 to 12 mm. long: flowers numerous, pik: 
Wings of the fruit horizontally crested at apex, narrow.—Common on the prairies 
(west of the Pecos) between the Santiago Range and San Jacinto Peak. 
“* Body of the fruit more rigid or woody, the wings consisting of a single lamina. 
+ Wings more or less attenuate above and terminating below the apex of the fruit, trans- 
versely veined, 
3. A. mellifera Dougl. Leaves ovate or oblong, rounded or truncate at base: 
involucral bracts oblong-lanceolate, white and scarious, 6 to 12 mm. long: flowers 
white: fruit with wings laterally elongated and narrowed, 6 to 8 mm. long.—From 
the sand hills near E] Paso to the Red River. April-June. 
+ + Wings completely encircling the fruit (making an orbicular outline), membranaceous 
and stronaly reticulated. 
4, A. micrantha Torr. Annual, prostrate: peduncles shorter than the petioles: 
flowers small and inconspicuous, reddish-green, the limb scarcely 4 mm. broad: fruit 
with 3 thin wings, emarginate above and below, the body rather broad and with a 
light spongy exterior.—Western Texas. Often confounded with the next. 
5. A. cycloptera Gray. Annual, stouter: flowers large and showy, upon elon- 
gated peduncles: fruit with firmer and more prominently veined wings, emarginate 
at neither end, the firm smooth narrow body usually 3-nerved.—Along the Rio 
Grande, from Dona Aa to below San Elizario, April-August. 
6. SELINOCARPUS (Gray. 
Herbs, with many dichotomously branching stems (woody at base}, 
white pubesence, opposite petiolate entire or sinuate leaves, short or 
elongated flowers, 2 to 5 unequal stamens, didynamous exserted anthers, 
peltate stigma, and fruit with 5 (or by abortion 3) veinless wings, 
1. S. diffusus Gray. Scabrous and subviscid, depressed or diffuse spreading: 
leaves ovate or ovate-oblong: flowers usually in pairs, subsessile: calyx tube 4 em, 
long: stamens 5,—Cations of the Rio Grande and on the Presidio del Norte. August= 
October. 
2, S. chenopodioides Gray. Grayish, puberulent, erect: leaves broadly ovate or 
subcordate: flowers cymulose-fascicled, pedicelled, small: calyx short, cup-shaped, 
with hardly any tube: stamens 2.—Gravelly hills and valleys of the Rio Grande, 
from El Paso to Presidio del Norte and Ixion County. August. 
3. S. angustifolius Gray, Subviscid-puberulent, slender, 15 to 25 em. high: leaves 
narrowly elliptic: flowers solitary, at length pendent: calyx funnelform, tube 2.5 to 
5 em, long: stamens 5.—Grayelly tablelands near Presidio del Norte and the Chenate 
Mountains. 
7. ACLEISANTHES Gray. 
Herbaceous (often woody below), with opposite entire leaves, termi- 
nal and axillary (often solitary) white flowers, an elongated perianth, 
