CATALOGUE. 163 



and produced above into a short, stout, inflexed awn (on either side). 

 Chaff twice as long as the achenium; margins scarious and somewhat 

 fimbriate or ciliate. — On limestone rocks, Camp Bowie, Ariz. (452). 

 Comparing the above with the original description, it will be discovered 

 that there are some important differences ; but as the specimens have been 

 compared by Mr. "Watson with the types in Cambridge, I cannot hesitate 

 to assign them here. — Plate VIII. Branches, natural size. 1. Ray-flower. 

 2. Disk-flower and subtending chaff. 3. Disk- corolla, style protruding. (1, 

 2, and 3 magnified about 2 diameters.) 4. Style and stigma (20 diame- 

 ters). 5. Mature achenium (15 diameters). 



Actinomeris longifolia, Gray (PI. Wright. 2, p. 89). — Stems erect, 

 slender, terete, glabrous ; leaves opposite, sub-opposite, or alternate, linear- 

 lanceolate, sessile, acute, denticulate or entire, plainly reticulate, scabrous 

 on upper surface and hispidly scabrous beneath; peduncles, corymbose, 

 naked, hispid, monocephalous ; heads 1-2' in diameter ; involucre with 

 scales in two series, the outer of which are lanceolate and with attenuated 

 tips, the inner are shorter and obtuse, resembling the chaff of the recep- 

 tacle, which is hardly longer than the mature achenium ; achenia oval, 

 distinctly winged to the bottom, awnless or with a single short awn 

 occasionally; ligules yellow, sometimes 2-3-toothed, 6-10" long. Leaves 

 sometimes 8' long and only 6" wide. — Sanoita Valley, Southern Arizona, 

 (608), and probably not far from the original locality whence it was taken 

 by Mr. Wright. 



Verbesina* encelioides, Benth. & Hook. (Ximenesia encelioides, Cav., 

 T. & Gr. Fl. ii, 359.) — Annual, hoary-pubescent, green and almost smooth, 

 branched from or near the base ; leaves triangular-ovate or cordate, or 

 sub-hastate, irregularly sinuate-dentate; upper petioles winged and dilated 

 at base into a lobed auricle ; involucre with scales in 2-3 series, the outer 

 lanceolate acute, pubescent, the inner shorter and smoother ; rays numer- 

 ous, cuneate-oblong, 4-7" long, 3-toothed at apex ; achenia of the disk with 

 a wide and strong wing; pappus (disk) of two short, weak awns. — San 



* Verbesina, Linn. — Similar to the preceding genus (Actinomeris), except that the rays are fertilo 

 and the disk- achenia are more distinctly 2- winged and 2-awned. 



