200 
tube wholly destitute of ligule, small compressed achenes, and pappus 
of a single series of soft capillary bristles (sometimes an added outer 
series of short bristles or scales). 
1. C. Coulteri Gray. Commonly branched, 3 to 6 dm. high, bearing numerous 
small heads in a mostly crowded thyrsoid leafy panicle, viscidly pubescent or partly 
hirsute: stem leaves linear-oblong, the lower spatulate-oblong and with partly clasp- 
ing base, from dentate to laciniate-pinnatifid: involucre 2 to 4 mm. high, hirsute, 
considerably shorter than the soft pappus: flowers whitish: perfect flowers only 5 
to 7.—Throughout western Texas, in river bottoms, etc. 
33. BACCHARIS L. (GROUNDSEL-TREE. ) 
Commonly smooth and resinous or glutinous shrubs, with whitish or 
yellow dicecious flowers (all tubular), imbricated involuere, corolla of 
the pistillate flowers very slender and thread-like, of the staminate 
larger and 5-lobed, tailless anthers, ribbed achenes, and pappus of cap- 
illary bristles (scanty and tortuous in the sterile plant, very long and 
copious in the fertile). 
* Pappus of the fertile lowers very copious and pluriserial, elongated in fruiting, soft: 
achenes 5 to 10-costate: 3 to 6 dm, high. 
1. B. Wrightii Gray. Very smooth and glabrous, diffusely branching, sparsely 
leaved: slender branches terminated by solitary heads: leaves linear, 1-nerved, 
small, the uppermost linear-subulate: involucre 8 to 10 mm. high, its bracts lance- 
olate, gradually acuminate, conspicuously scarious-margined, with a green back: 
pappus fulvous or sometimes purplish, 4 times the length of the scabrous-glandular 
8 to 10-nerved achene.—Western Texas. 
2. B. Texana Gray. Glabrous, with many nearly simple rigid stems from a 
woody base, leafy to the top, where it bears a few corymbosely disposed heads: 
leaves 2.5 to 5 em. long, linear, 1-nerved, rather rigid: involucre 6 mm. long, of 
firmer and narrower merely acute bracts: achenes smoother.—Forming large 
patches in dry prairies. 
** Pappus of the fertile flowers more or less copious, but wniserial or nearly 80, conspic- 
uously elongating in fruit, soft and fine, mostly flaccid and bright white : achenes 10- 
nerved: shrubs 9 to 86 dm. high. 
3. B, halimifolia L. Cauline leaves from dilated-obovate to oblong with cuneate 
base, attenuate into a petiole, laciniately or angulately 3 to 9-toothed, those of the 
flowering branchlets becoming lanceolate and mostly entire: heads in peduncu- 
late and paniculate glomerules (3 to 5 together): involucre of male heads only 4 
mm. long, of oblong-ovate obtuse bracts; of the female rather longer and narrower, 
the inner bracts linear-lanceolate and acute.—Along the seacoast from New 
England to the Rio Grande. 
4. B.salicina Torr. & Gray. Leaves mostly subsessile, from oblong to linear- 
lanceolate, sparingly toothed, rarely entire: heads or glomerules pedunculate: 
involucre of both sexes nearly 6 mm. long, of mainly ovate and acutish bracts.— 
On the Rio Grande near El Paso. 
5. B, angustifolia Michx. Rather strict: leaves narrowly linear (larger 5 to 8 
cm. long, 2 to 4 mm. wide), entire or with few denticulations; some lower ones 
broadly lanceolate and more serrate: heads or glomerules short-pedunculate, amply 
paniculate: involucre 4 mm. long, of oblong-ovate or lanceolate bracts, the outer 
obtuse, innermost acute.—Brackish marshes along or near the Rio Grande. 
