358 



safford: new bull-horn acacias 



puberulent at the base (when young) , glabrous at the blood red point. 

 Leaves of vegetative branches composed of 23 to 31 pairs of pinnae; 

 rachis 20 to 38 cm. long, broadly grooved, with the raised edges of the 

 groove puberulent, and with a single small nectar gland at the base of 



each pair of pinnae ; groove 

 broadening at the base of 

 the rachis and enclosing 20 

 to 25 small nectar glands, 

 these arranged approxi- 

 mately in 3 rows, truncate- 

 conoid in form, with a 

 central pore-like opening; 

 rachis of pinnae 30 to 58 

 mm. long, bearing 25 to 

 31 pairs of leaflets, these 

 linear-oblong, 5 to 7 mm. 

 long, 1 to 1.1 mm. broad, 

 with only the midrib con- 

 spicuous beneath, unequal 

 at the base, and usually 

 obtusely pointed at the 

 apex. Leaves of the 

 flowering branches rudi- 

 mentary, reduced to small 

 bracts about 1 cm. long 

 subtending the peduncles, 

 bearing minute stipular 

 spines and 4 nectar glands 

 but devoid of pinnae. 

 Flower heads 7 mm. long, 6 mm. in diameter, solitary or in pairs, 

 borne in the axils of the bracts on long erect branchlets composed of 

 many nodes; peduncles 8 mm. long, 0.75 mm. thick, provided with a 

 basal involucre of 4 connate bracts; form of interfloral bracteoles not 

 observed. Fruit lacking. 



Type in the Berlin Herbarium, collected at Porto Bello, Panama, 

 in 1825, by J. G. Billberg. It consists of a flowering branch with 

 several flower heads and two disintegrated leaves, but without en- 

 larged stipular spines. Since the publication of Dr. Schenck's paper 

 upon this group fine specimens of vegetative branches with large 

 spines were collected at the head of Gatiin Valley, Panama, in 1914, 

 by Mr. Henry Pittier (no. 6745). The latter are now in the United 

 States National Herbarium, sheets no. 716560 and no. 716561. 



In its large leaves, composed of many pinnae, this species resembles 

 Acacia Cookii; but the presence of many small glands at the base of 

 the rachis separates it at once from that species, and the arrangement 

 of its flower heads on specialized branches instead of in clusters in the 

 axils of large spines places it in the section Ramulosae. 



Fig. 1. Acacia multiglandulosa Schenck: a, 

 enlarged stipular spines, with base of vegetative 

 leaf attached showing numerous extrafloral nec- 

 tar glands; h, leaf base, with minute stipular 

 spines; c, nectar gland. Specimen from Panama 

 {Pittier 6745). a and b, natural size; c, scale 3. 



