86 PROCEEDINGS OF THE AMERICAN ACADEMY. 



red oblong marginal glands (very rarely a few glands scattered on the 

 lower side of the leaf) : heads a little longer than in the type : awns 

 2 mm. long: akenes 6 or 7 mm. long. — P. punctata^ Wats. Proc. Am. 

 Acad. xxiv. 58, not Jacq. — In shaded ravines and on mountain bluffs, 

 Southern Arizona to the Souora coast. Arizona (Palmer, 1867, no. 129), 

 Tuscan (Smart, no. 382), Santa Catalina (Lemmon, no. 3031), Malpais 

 Mts. (Pringle) ; Sonora, Guaymas (Palmer, 1887, no. 224). 



* * Rigif] glaucous perennial with ligneous root : leaves entirely witliout setae : 

 rays 6 to 9 mm. long : pappus various, erect, not divergent, the arisliform 

 pales, when present, generally minutely serrulate. 



P. imberbis, Gray. Stems sulcate, 3 to 9 dm. high, panicnlately 

 branched, sparingly leafy and jnnciform : leaves thick, linear, with revo- 

 lute margins, the longest 6 or 7 cm. long, channelled above, and with the 

 midrib very prominent beneath ; lower surfaces with two rows of scat- 

 tered elongated dark glands : peduncles about 2 cm. long, with a few 

 linear-subulate bracts, especially toward the tips : involucre cylindrical, 7 

 or 8 mm. high, 10-12-flowered, of 5 or 6 linear blunt soon involute bracts 

 marked with linear dark glands : disk-corollas with five longitudinal 

 purplish stripes along the tube and with a conspicuous dark gland at the 

 tip of each lobe ; rays with or without one or two small glandular dots : 

 akenes puberulent, 5 or 6 mm. long. — Pi. Wright, ii. 70 & in Torr. 

 Bot. Mex. Bound. 73; Rothrock in Wheeler Rep. vi. 172. — Southern 

 Arizona and adjacent Mexico. Arizona, near Fort Huachuca (Lem- 

 mon, no. 2783) ; Sonora, Sonoyta Valley (Wright, no. 1399, Rothrock, 

 no. 636). Chihuahua, Janos (Schott). Said to have a strong tere- 

 binthine odor. 



II. — SOME RARE AND UNDESCRIBED PLANTS COL- 

 LECTED BY DR. EDWARD PALMER, AT ACAPULCO, 

 MEXICO. 



Sclkria lithosperma, Willd., var. filtformis, Britton, Ann. N. Y. 

 Acad. Sc. iii. 231. Forming tussocks among underbrush on hills above 

 Acnpulco, November, 1894 (no. 76). Common in South Florida and 

 the West Indies, the type occurring in Southern Asia and Australia. 



Ruprechtia fusca. A tree about A^ m. high, the trunk 2 dm. 

 in diameter : bark of the slender branches pale brown, puberulent or 

 glabrate, somewhat sulcate and verrucose : ochrte cylindric, puberulent, 

 7 mm. long, soon deciduous : leaves obovate. 5 to 9 cm. long, 2\ to A\ cm. 

 broad, coriaceous, on thickish petioles 3 to 6 mm. long, below subcuneatc, 



