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5. GUILLEMINEA IIBK. 
Prostrate and branching lanate and leafy herbs from a perennial 
root, with opposite ovate entire leaves connate at base, minute perfect 
axillary lanate flowers, unequal bracts, campanulate calyx with obconic 
tube and 5-lobed limb, 5 stamens inserted at base of calyx lobes, minute 
anthers, short style with emarginate stigma, and an indehiscent utricle. 
1. G. densa (Willd.) Mog. Stems articulated, subfuscous, with opposite flexuous 
branches: leaves spatulate-oblong or oblong-lanceolate, 8 to 12 mm. Jong, punctate, 
glabrous above, canescently pilose-pubescent below, reticulated, the upper subses- 
sile and ovate or ovate-lanceolate: bracts white, the lower ovate, acute, the upper 
oblong-ovate and obtuse: flowers minute, white (Jllecebrum densum Willd. G. illece- 
broides HBK.)—Plains, from the Limpia to the Rio Grande and San Diego. 
2. G, lanuginosa (Poir.) B.& H. Stems slender, much branched: leaves sessile, 
4 to 6 mm. long, elliptical: radical ones obovate-oblong, 16 to 24 mm. long, scarcely 
acute, appressed-pilose above and villous beneath: bracts subequal, ovate, mucro- 
nate, glabrous, white: sepals lanceolate-subulate, rigid, 3-nerved: fruit oblong-ovate, 
glabrous, pale green (Paronychia lanuginosa Poir.)—From the flats of the Pecos to 
Laredo, 
6. CLADOTHRIX Nutt. 
Low annual or erect and woody at base, with small round entire 
petiolate leaves, very small axillary flowers (solitary or few) having 3 
concave hyaline bracts, calyx of 5 erect equal oblong rigid-scarious 
sepals which are somewhat pilose with verticillately branching hairs, 
large oblong anthers, and an ovate-globose indehiscent utricle. 
1. C. lanuginosa Nutt. Annual, prostrate or ascending, 3 to6 dm. high, diffusely 
branched: leaves ronnd-obovate to rhomboidal, more or less attenuate at base, often 
in 3's, two of them smaller: flowers mostly in pairs: sepals obtuse, twice longer than 
the broader hairy-tipped bracts: utricle glabrous, shorter than the sepals. (Alternan- 
thera lanuginosa Moq.)—From the tlats of the Pecos westward and southward along 
the Rio Grande. 
2. C. suffruticosa (Torr.) Watson. Somewhat woody at base, erect and much 
branched, 1 to 1.5 dm. high: leaves smaller than in the last, rounded or ovate, truncate 
or usually rounded at base, with very short petiole. (Alternanthera (?) suffruticosa 
Torr.)--Valley of the Rio Grande, 
7. ALTERNANTHERA Forsk. 
Herb, with perfect 3-bracteate flowers, 5 sepals, 5 stamens united 
into a short cup at base, minute and tooth-like sterile filaments, short 
style, capitate stigma, and an indehiscent utricle. 
1, A. repens (L.) Kuntze. Stems prostrate, forking, pubescent, 15 to 30 em. long: 
leaves smoothish, oval or obovate, narrowed into a petiole: heads dense, oval, 
white: sepals lanceolate, spine-pointed, woolly on the back with barbed hairs, the 
two inner ones much smaller: sterile filaments as long as the tertile ones.—(Achyran- 
thes repens L, A. achyrantha R. Br.)—F rom the banks of the Pecos to Gillespie County. 
8. GOSSYPIANTHUS Hook. 
Perennial herbs, with procumbent flexuous woolly stems, obovate or 
elongated-spatulate rigid and subcoriaceous radical leaves, ovate entire 
sessile more or less silky-woolly stem-leaves, perfect flowers, 2 or 3 deli- 
