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short, the uppermost mucronate; stipules ovate, shorter than the leaves: calya 
turbinate at base, with a ring of hooked hairs; sepals reddish-brown, broadLy scari- 
ous and dilated above, the back produced intoa short white and somewhat recurved 
horn: set very minute.—Texas. 
2.P.setacea I. & G. Slender, 7 to 12 em. high, nearly glabrous: stems erect, 
branching intothe many times dichotomous diffuse cyme: leaves subulate-setaceous, 
erect; stipules shorter, lanceolate, attenuate: bracts similar to the leaves, euspidate: 
sepals (as well as peduncles and leaves) brownish, hairy at base, minutely scarious 
on the margin, apex arched within, back produced into a slender whitish diverging 
awn: set as long as the filaments.—Gillespie County. 
3. P. Lindheimeri Gray. Glabrous, erect, often 9 em. high: stems diffusely much 
branched into many open dichotomous cymes: leaves and bracts setaceous, mucro- 
nate, shorter than the internodes: calyx minutely pubescent at base, the awn much 
shorter than the segments.—Middle and western Texas. 
** Perennial: sepals cuspidate, the apex somewhat cucullate or concave within, but not 
dilated. 
4,P, dichotoma Nutt. Smooth, tufted, 12 to 30 cm. high, ascending from a rather 
woody base: leaves (12 to 36 mm. long) and bracts subulate: cymes open, many times 
forked: sepals short-pointed : setze minute.—From the Chisos Mountains to Gillespie 
County. 
5.P. Jamesii T. & G. Subcespitose, much branched from the somewhat woody 
base, minutely puberulent: leaves filiform-subulate, obtuse or mucronate: the forked 
cymes rather close: calyx narrowly campanulate, with turbinate base.—From Mid- 
dle Fork of Red River to the San Pedro and E] Paso. April-July. 
AMARANTHACEHR. (AMARANTH FAMILY.) 
Chiefly herbs, with entire leaves destitute of stipules, small perfect 
or unisexual flowers usually subtended by searious bracts and with a 
persistent calyx of 1 to 5 more or less scarious sepals (sometimes want- 
ing in Aecnida), hypogynous stamens as many as the sepals and opposite 
them or fewer, and a 1-celled ovary containing one to many ovules. 
* Anthers 2-celled: ovary 2 to 8-ovuled: leaves alternate. 
1. Celosia. Stamens united at base: utricle circumscissile. 
* * Anthers 2-celled: ovary 1-ovuled: leaves alternate, 
2. Amaranthus. Flowers monucious, diccious, or polygamous, all with a distinct 
calyx: utricle various. 
3. Acnida. Flowers diwvious: calyx none in the fertile flowers: bracts small: 
utricle indehiscent. 
4. Acanthochiton. Flowers dicwcious: pistillate bracts large, cordate: utricle 
circumscissile. 
* * * Anthers 1-celled: ovary l-ovuled: leaves opposite (except in Dicraurus), 
+ Stamens perigynous: flowers capitate. 
5. Guilleminea. Stamens inserted on the throat of the calyx-tube, 
+ + Stamens hypogynous. 
++ Stigma mostly simple, capitate or emarginate, rarely 2-lobed: flowers axillary. 
6. Cladothrix. White with stellate-tomentum: flowers not capitate, 
7. Alternanthera. Flowers capitate. 
8. Gossypianthus. Calyx densely lanate: flowers not capitate. 
11874—No. 3 2 
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