safford: new bull-horn acacias ■ 357 



an obtuse point and narrowing at the base into a stipe-like neck, sev- 

 eral legumes radiating from the indurated torus; fruiting peduncle 

 1.5 to 2 cm. long and (in the type) as thick as the flowering branch 

 bearing it; seeds 12 to 14. Large spines dark brown, V-shaped, terete, 

 tapering gradually to a sharp point, minutely puberulous near the 

 base, at length glabrous and glossy, 50 mm. long, 5 mm. thick near 

 the base, usually perforated and inhabited by stinging ants. Small 

 spines scarcely exceeding 1 mm. in length, puberulent at the base, 

 terminating in a polished reddish point, in the type not acicular as in 

 A. Donnelliana. Leaves of the vegetative branches composed of 

 20 to 26 pairs of pinnae, these 46 to 60 mm. long, sometimes subopposite; 

 leaflets 34 to 44 pairs, linear-oblong, approximate or contiguous, 5 

 to 5.5 mm. long, 1 to 1.4 mm. broad, usually rounded or obtuse at the 

 apex, unequal at the base, puberulent when young, often spreading 

 nearly at right angles with the rachis of the pinna ; main rachis grooved 

 above, puberulent, devoid of nectar glands except at the base, the 

 groove here broader and bearing 10 to 12 irregularly disposed nec- 

 taries, some of them apparently geminate. Leaves of flowering branches 

 varying greatly in size, the larger ones resembling the vegetative leaves 

 but with fewer pinnae, and like them devoid of interpinnal nectar 

 glands, the succeeding ones sometimes with interpinnal glands be- 

 tween the uppermost pinnae, and the smallest bearing 4 to 6 pairs of 

 more or less rudimentary pinnae, nearly all of them with interpinnal" 

 nectar glands; all floral leaves with a row of 4 to 6 prominent nectar 

 glands at the base of the rachis, and with minute stipular spines sub- 

 tending the calyx-like buds from which issue the flower heads. 



Type in the United States National Herbarium, no. 692157, col- 

 lected near San Fernandino, between Tuxtla and Chicoasen, state of 

 Chiapas, Mexico, January 12, 1907, by Guy N. Collins (no. 164), in 

 association with Acacia Collinsii Safford. At the time of collection 

 (the dry season) nearly all the plants were entirely leafless. 



This species, which appears to be intermediate between A. Donnel- 

 liana of Honduras and A. multiglandulosa of Panama, has thin fiat 

 pods, and its spines are uniformly quite straight. On the specimen 

 collected nearly all the spines were punctured, but very few of them 

 contained ants. Those that were secured occurred not in colonies 

 but as individuals in the spines. 



Acacia multiglandulosa Schenck, Repert. Nov. Sp. Fedde 12: 362. 

 1913.— Bot. Jahrb. Engler 50: 480. 1914. Group Globuliferae, sec- 

 tion Ramulosae. A shrub or small tree with Very long narrow bipin- 

 nate leaves, some of them provided with large stout polished dark- 

 colored connate stipular spines, these perforated and inhabited by 

 ants, others with minute inconspicuous subulate spines. Large spines 

 (when living) maroon or dark wine-colored, glossy, widely divergent, 

 straight or very slightly curved outward, stout, terete, somewhat flat- 

 tened at the base, 40 mm. long, 8 to 10 mm. broad at the base. Small 

 spines at the base of equally large leaves scarcely 2 mm. long, minutely 



