364 saffokd: myrmecophilous acacias 



slender pulverulent peduncles, and relatively broader and shorter leaflets 

 with minute marginal hairs. Spikes before anthesis covered with the 

 pale flesh-colored, scalelike, imbricated, suborbicular limbs of the pedi- 

 celled interfloral bracteoles, after anthesis bright lemon yellow from the 

 mass of stamens, 23 to 26 mm. long, 4 to 5 mm. thick, the axis not exceed- 

 ing in thiclaiess the slender peduncle, this straight and rigid, about 8 mm. 

 long and 0.5 mm. thick, pale brownish, clothed with white puberulence, 

 and bearing a 4-toothed basal involucel , this puberulent outside. Flowers 

 crowded; calyx flesh-colored, broadly ovoid or ellipsoid, inflated, 1.25 mm. 

 high, 1 mm. broad, minutely puberulent about the margin, obscurely 

 6-lobed or subentire; corolla pale yellow, puberulent, 6-lobed, exceeding 

 the calyx by about one-fourth its length; filaments and anthers pale 

 yellow; style filiform. Legume 2-valved, dehiscent by both dorsal and 

 ventral sutures, curved, compressed, 4.5 cm. long, 1 cm. broad, tapering 

 at the base into a stipe like neck, terminating at the apex in a point. 

 Seeds about 12, in a single row, embedded in a sulphur-yellow pulpy 

 aril, broadly ovoid, 5 mm. long, 4 mm. broad, somewhat compressed into 

 a thick oblique ovoid disk, the testa hard, smooth, glossy dark brown. 

 Large stipular spines reddish bro\\ai, becoming blackish, broadly 

 V-shaped or deltoid, 2.6 to 3.2 cm. long, 9 to 11 mm. broad at the base, 

 this inflated and usually compressed, the apex abruptly acuminate 

 and terminating in a very slender, fine point. Spines of the flowering 

 branchlets minute, subulate. Vegetative leaves not observed. Leaves 

 of the flowering branches sometimes rudimentary, the perfect ones com- 

 posed of 1 to 6 pairs of pinnae; rachis pubescent, 3 to 4.5 cm. long, without 

 interpinnal glands, but with 1 to 3 contiguous pubescent porelike basal 

 glands and usually a similar but smaller terminal gland on the pubescent 

 rachises of the pinnae just beneath the last pair of leaflets, very much as 

 in A. Collinsii. Leaflets oblong-obovate, fringed with short hairs. 



Type in the Herbarium of the New York Botanical Garden; duplicate 

 in U. S. National Herbarium, no. 677927, collected in the vicinity of 

 Penonome, Panama, February 23 to March 22, 1908, by R. S. Williams 

 (no. 113). 



GROUP IV. FOLLICULARES 



Pericarp a follicle, dehiscing by a single suture; seeds in a single row. 

 Leaf rachis with a beadlike nectar gland at the base of each pair of 

 pinnae; nectar glands of the petiole 1 to several, or wanting. 



Section 7. Bursariae Schenck 



Large stipular spines of vegetative branches much flattened and very 

 broad, their bases connate and pocket-like, often resembling an inverted 

 bicome chapeau. Flowers distinct, not closely crowded, forming a lax 

 linear spike with a slender, often flexible rachis. Pods slender, falcate or 

 curved, compressed, the seeds approximate, inclosed in a thin, whitish 

 or brownish, feltlike aril. 



