safford: myrmecophilous acacias 359 



bracteoles recurved. Calyx broadly tubular, resembling that of A. 

 spadicigera, ferruginous, the upper portion sparsely hirtellous; corolla 

 barely exceeding the calyx, the aperture splitting at anthesis into 5 or 6 

 divisions. Fruit inflated, indehiscent, terminating in a slender sharp 

 beak, narrowed at the base into a stipelike neck, glabrous, smooth, 

 olive green when young, at length bright wine-colored. Seeds 12, in 2 

 series, broadly ovoid, compressed, embedded in a mass of sweetish 

 pulp; testa hard, smooth, dark brown. Leaves closely resembling those 

 of A. spadicigera, those of the vegetative branches with 7 to 12 pairs of 

 pinnae; elongated nectar gland on the petiole crater-like, placed at the 

 base of the basal pair of pinnae, sometimes with a smaller raised cylin- 

 drical gland below it, and rarely with a second, somewhat elongated 

 gland at the base of the second pair of pinnae; leaflets 17 to 29 pairs, 

 linear-oblong, unequal at the base, the midrib and upcurving lateral 

 nerves conspicuous beneath, as in A. spadicigera. Leaves of the inflores- 

 cence smaller; pinnae 2 to 5 pairs, the petiole bearing 1 or 2 raised glands, 

 a gland often present also at the base of the second pair of pinnae. 



Type in the U. S. National Herbarium, no. 692170, collected in the 

 vicinity of Rascon, State of San Luis Potosi, Mexico, July 19 to 22, 1905, 

 bj^ Dr. Edward Palmer (no. 669). 



4. Acacia furcella sp. nov. Related to Acacia spadicigera and A. 

 Hernandezii, but having polished black or dark browm, forklike spines 

 with subcuneiform base and erect, slightly diverging or subparallel 

 prongs, much abbreviated or suppressed flowering branch] ets, and spikes 

 crowded in clusters. Base of spines 12 to 16 mm. broad, the prongs 

 terete, 50 to 60 mm. long, long-acuminate at the apex. Flowers densely 

 crowded, resembling those oi A. spadicigera, but more densely hirtellous. 

 Spikes cylmdrical 30 to 40 mm. long; receptacle (axis of spike) fusiform, 

 6 to 8 mm. thick when mature; peduncles 10 to 14 mm. long, 2 to 4 mm. 

 thick; involucre basal, 4-toothed, similar to that of A. spadicigera. 

 Calyx ferruginous, 1.4 mm. long, 0.6 mm. broad at anthesis, thickly- 

 covered with minute short straight projecting hairs; corolla 4 to 6-lobed, 

 slightly longer than the calyx. Interfloral bracteoles brown, the laminae 

 ovate-acuminate, peltate, sagittate at the base, scabrous above, edged 

 with minute short straight marginal hairs. Fruit wanting. Leaves of 

 vegetative branches not observed; those of flowering branches with 3 to 

 5 pairs of pinnae; rachis puberulent, 4 to 6.5 cm. long; nectar glands 

 similar to those of A. Hernandezii; leaflets 13 to 24 pairs, 9 mm. long, 

 2 mm. broad, reddish brown when dry, the midrib and lateral nerves 

 prominent beneath as in ^. spadicigera. ^ 



Type in the U. S. National Herbarium, no. 692166, collected on the 

 shore of Lake Catemaco, southern Veracruz, Mexico, at an elevation 

 of 1000 feet, April 26, 1894, by E. W. Nelson (no. 427). 



5. Acacia nicoyensis Schenck, Repert. Nov. Sp. Fedde 12: 360. 

 1913.— Bot. Jahrb. Engler 50: 463. 1914. 



Type in the Berlin Herbarium, collected on the shore of the Gulf of 

 Nicoya, Costa Rica, in February, 1900, by A. Tonduz (no. 13538) ; 

 duplicate of type in the U. S. National Herbarium, no. 577752. 



