OF ARTS AND SCIENCES. 145 



obliquely rhombic, obtuse or retuse, cuncate at base, obscurely cren- 

 ulate or entire, 6 to 10 lines long, very finely pubescent beneath, 

 nearly glabrous above : panicles small and slender, axillary, shorter 

 than the leaves : young fruit somewhat pubescent, oblong-obovate, 

 2 or 3 lines long. — On limestone ledges in the mountains near Mon- 

 terey ; May and July, 1889 (u. 2093). 



Decatropis Coulteri, Hook. f. Specimens of this species in 

 immature fruit, collected by Mr. Pringle in 1889 (n. 2558), have 

 the carpels sessile and distinct, coriaceous, semicircular or reniforra in 

 outline, doubly wing-carinate on the back, and about 2 lines long. 

 The solitai-y reniform seed is apparently exalbuminous, and is at- 

 tached to the middle of the inner angle of the cell. The plant is a 

 slender shrub, 6 to 20 feet high, branching sparingly near the sum- 

 mit, and with evergreen foliage. It grows in open clumps on the 

 limestone ledges of the mountains about Monterey, apparently spread- 

 mg and propagating by its roots. 



BuRSERA Pringlei. Glabrous throughout : petiole and very 

 narrowly winged rhachis of the leaf slender and elongated (3 to 6 

 inches long) ; leaflets 5 to 12 pairs, rather thin and not rugose, 

 linear-lanceolate and acuminate, serrate, 1 to 1^ inches long: racemes 

 slender, 1 to H inches long, 2-4-flowered, the curved pedicels 3 or 

 4 lines long : flowers unknown : fruit oblong-obovate, 3 lines long. — 

 On rocky bluffs of the Rio Grande de Santiago near Guadalajara ; 

 October, 1889 (n. 2336). Near B. Galeottiana. 



BuRSERA Palmeri, Watson, var. glabrescens. Leaflets 5 to 

 10 pairs, glabrous above or nearly so, very rugose, 6 to 10 lines long. 

 — In the same locality (n. 2335). 



BuRSERA pubescens, Watson, Proc. Amer. Acad. 24. 44, based 

 upon foliage only, is proven by specimens collected during the past 

 season by Brandcgee and Palmer to be Veatchia Gedrosensis, Gray. 



Thouinia acuminata, a tree (25 feet high) with slender 

 branches, very minutely puberulent or glabrate : leaves 3-foliolate, 

 the thin leaflets lanceolate, acuminate, narrowed at base, acutely 

 serrulate, ciliolate, 2 to 4 inches long by 9 to 18 lines wide, about 

 equalling the slender petioles : panicles slender, about equalling the 

 leaves : flowers whitish, pedicellate, the stamens twice longer than 

 the orbicular or round-obovate sepals and petals : fruit glabrous, the 

 broadly divaricate wings 6 lines long. — In a barranca near Guada- 

 lajara; October, 1889, in flower; December, in fruit (n. 2485). 



Thouinia Pringlei. Branchlets and petioles stout, tomentose : 

 leaves trifoliolate ; leaflets finely pubescent above, tomentose beneath, 



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