11)3 



tinged with purple, 8 mm. long; legume stipitate, S-jointed, constricted on both 

 sides, hut most on the dorsal side, nearly glabrate. 



Collected at Acaponeta, June 26, 1897 (No. 1487), and between Rosario and Colo- 

 mas, July 12, 1897 (No. 1616). 



. This species is near, perhaps too near, A. petraea Robinson, but differs in coining 

 from the low, hot coastal plain of the west coast, while J. petraea comes from much 

 higher elevations; it also has very different pubescence, larger leaflets, smaller 

 bracts and flowers, glabrous calyx, etc. 



CALLIANDRA. 



Mexico and Central America contain about 35 species of Calliandra, 

 all but 5 of which are represented in the National Herbarium. Ben- 

 tham, in his monograph of the genus, enumerates just 100 species, of 

 which he assigns 25 to North America. Mr. Hemsley, in the Biologia 

 Centrali- Americana, lists 23 species. 



I have decided to publish the four following species only after a very 

 careful study of all the Mexican members of the genus. It was my 

 intention to publish here a synopsis of all our Mexican species, but 

 owing to the difficulty in deciding the identity of 2 or 3 of them, I have 

 postponed this revision to a future paper. 



Series Laetevirentes. 

 Calliandra oaxacana Rose, sp. nov. 



Nine to 15 dm. high; branches slender and glabrous; pinnee 1 to 2 pairs; stipules 

 2 mm, long, obtuse; petiole without glands, 2.5 to 3.5 cm. long, slender; leaflets 14 

 to 18 pairs, oblong, acute, 5 to 6 mm. long, glabrous except a few hairs along the 

 margin (and also on the secondary rachis); heads 1 to 3 in the axils of the leaves; 

 peduncles slender, 5 to 7 cm. long, longer than the leaves; stamens 18 to 20mm. 

 long, reddish; pods unknown. 



Collected by Mr. C. G. Pringle, July 10, 1897, on granite ledges, Tomellin Canyon, 

 Oaxaca, altitude 1,050 meters (No. 6734). 

 Calliandra penduliflora Rose, sp. nov. 



A shrub, 3 meters or so high, with light gray bark; young branches covered with 

 short spreading pubescence; leaves large; pinna; 1 or 2 pairs; leaflets 4 to 6 pairs, 

 unequal, the largest ones 4 to 5 cm. long, oblong, rounded at apex, very oblique at 

 base, 3 to 5 nerved at base, pubescent on both sides; stipules variable, 6 to 10 mm. 

 long, striate; inflorescence axillary or more or less naked and paniculate above; 

 peduncles often 2 to 4 in the axils, long and slender, sometimes 1 dm. long; heads 

 large and densely flowered; calyx and corolla glabrous; stamens long and pendent; 

 fruit not seen. 



Collected by J. N. Rose in southern Durango, August 16, 1897 (No. 2332), and at 

 Bolanos, September 14 (No. 2924). The latter collection is the type of the species. 



This is a very beautiful plant, and not closely related to any other of the Mexican 

 species. 

 Calliandra unijuga Rose, sp. nov. 



Shrub 12 to 24 dm. high, with many short stiff grayish branches; leaves small; 

 petioles 2 to 4 mm. long; pinmo 1 pair; leaflets 2 to 4 pairs, leaflets oblong, 2 to 4 

 mm. long, nearly glabrous, obtuse, sometimes apiculate; peduncles axillary, 15 to 

 20 mm. long; stamens long, white with pink tips; legume 3.5 cm. long, glabrous. 



Collected by Lucius C. Smith at Cuicatlan, State of Oaxaca, altitude 1,800 feet, 

 September 24, 1894 (No. 203), and by Mr. E. W. Nelson at the same locality, October 8 

 to 24, 1894 (No. 1648). 



