272 PROCEEDINGS OF THE AMERICAN ACADEMY 



beneath : flowers mostly sessile or nearly so and undeveloped, some- 

 times pedunculate and larger, the calyx sparingly short-hairy : pods 

 usually glabrous or slightly hairy on the sutures, sometimes thinly 

 covered with short appressed hairs, 8 to 10 lines long, attenuate at 

 base, 3-8-seeded. — On pine plains at the base of the Sierra Mad re, 

 Chihuahua; C. G. Pringle (n. 1499), Oct., 1887. Resembling 

 C. Martia, C. humifusa, and C. Lemmoni in habit and in its dimor- 

 phous sessile or pedunculate flowers. 



Leucena Greggii. A small tree, 10 to 15 feet high, the young 

 parts finely pubescent with short spreading yellowish hairs, becoming 

 glabrate : stipules triangular-ovate, acuminate ; pinna? 5 to 7 pairs, 

 with a conspicuous subcylindrical gland at the base of each ; leaflets 

 numerous (15 to 30 pairs), narrowly oblong, acute or subacuminate, 

 3 to 6 lines long, the lateral nerves none or very faint: peduncles 

 axillary, solitary or in pairs, 1 to 3 inches long : pods linear, 8 inches 

 long by 4 to 6 lines broad, attenuate below to a short stout stipe and 

 beaked with a slender style 1 or 2 inches long : seeds longitudinal. — 

 Near Rinconada (Dr. Gregg, 1847), at Saltillo (307 Palmer, 1880, 

 distributed as L. glauca), and mountains near Monterey (C. S. Sar- 

 gent, 1887). Distinguished from L. glauca by the glands of the 

 rhachis, the more faintly nerved leaflets, the narrower thicker and 

 long-attenuate pod, and the longitudinal seeds. 



Pithecolobium Palmeri, Hemsl., var. recurvum. Flowering 

 specimens which closely resemble this species, but have the rather 

 short spines strongly recurved, were found in the Mapula Mountains, 

 Chihuahua, by C. G. Pringle, April, 1887. 



Potentilla Pringlei. Stems decumbent, a foot long or more 

 including the paniculate few-flowered inflorescence, finely tomentose : 

 leaves mostly radical, ternately digitate ; leaflets broadly linear (1 or 

 2 inches long by about 2 lines broad), acutely toothed, nearly glabrous 

 above, densely white-tomentose beneath : flowers on very slender ped- 

 icels, rather large, yellow ; calyx-lobes lanceolate, the accessory lobes 

 linear : stamens 20 : styles filiform, nearly terminal. — On pine plains 

 near the Sierra Madre, Chihuahua; C. G. Pringle (n. 1494), Sept., 

 1887. Near P. gracilis. 



Till^ea viridis. Stems numerous, much branched, spreading, about 

 2 inches long : leaves narrowly linear, acute : flowers solitary in the 

 axils, very shortly pedicellate, minute ; sepals broad and rounded ; 

 petals twice longer, equalling the carpels, obtuse : follicles green, ob- 

 tuse, 8-seeded, less than half a line long. — Wet places, base of the 

 Sierra Madre, Chihuahua; C. G. Pringle (n. 1561), Oct., 1887. 



