﻿n^tadenia.] MR. G. BENTHAM ON THE MIMOSE^. 369 



18. P. MACRADENIA, Bentli. ! in Rooh. Journ. JBot. iv. 335. Arborea?, inermis v. 

 aculeis raris minimis. Pinnse G-lO-jugse ; foliola falcata, nitida, costa subcentrali, 3-4 

 lin. longa. Glandula petiolaris maxima, oblonga. Ovarium longiuscule stipitatum. 

 Legumen rectum. — Fl. Bras. Mim. 



Kab. Tropical America : Brazil, prov. Minas Geraes. 



Resembles P. communis, and, like that species and P. pteroclada, lias the second year's branches often 

 bordered by corky wings, but readily distinguished from them by the large gland and by the villous 



ovary. 



19. P. MICRACANTHA, Benth. ! in Mart. Fl. Bras. Mim. Scandens, aculeis minutis 

 paucis. Pinnae 8-15-jug8e; foliola falcata, nitida, costa submarginali, 1-2 lin. longa. 

 Petiolus ssepius eglandulosus. Ovarium breviter stipitatum. 



Hab. Tropical America : Brazil, prov. Rio Janeiro. 



Resembles P. contarta, with similar small leaflets j but the scandent habit, the presence of small prickles, 

 and several minor characters appear sufficiently to distinguish it. 



Mimosa dumetorum, A. de St.-Hil. PI. Rem. Bres. Introd. 11 [Acacia dumetorum, DC. Prod. ii. 458), 

 from the very short diagnosis given, is probably a Piptadenia closely allied to, if not identical with, 



P. micracantha, 



1 1 Ovarium glahrum. 



- 



{ Corolla tenuis^ calyce minimo 4^-5plo longior. Stamina longa. 



20. P. BiUNCiFERA, BeutJi. in HooTc. Journ. Bot. iv. 337. Arborea, aculeis stipularibus 

 ffeminis recurvis. Pinnae 8-12-jug8e ; foliola falcata, obtusa, 2-3-linearia. Spicae laxae, 

 3-pollicares. Legumen 8-9 poll, longum, 1 poll, latum.— P/. Bras. Mim. 



Sab. Tropical America : Brazil, prov. Piauby and Babia. 



Very closely allied to P. suhtilifolia, from which, as far as hitherto known, it differs in the longer looser 

 spikes and in the pods very much longer in proportion to the breadth. Both species arc remarkable for 

 the small calyx, long narrow corolla divided to the middle only, and the long stamens, all rather of a 

 Mimosa than of a Piptadenia; but both the pod and the glands of the anthers are those of Piptadenia. 



21. P. SUBTILIFOLIA, Benth. in Book. Journ. Bot. iv. 337. Arborea, aculeis geminis 

 stipularibus subrectis v. recurvis v. inermis. Pinnae S-lO-jugae ; foliola falcata, obtusa, 

 1 i_2-linearia. Spicse longiusculse, 1-2-pollicares. Legumen " oblongum." 



"" Acacia subtilifolia, H., B. et K. ! Nov. Gen. et Sp. vi. 268 (aculeata). 

 Acacia viridiflora, Kunth! Mim. 81, t. 25 (subinermis) , non Benth. PI. Hartw. 



Bab. Tropical America : Ecuador, banks of the Chota river, and at San Felipe in the 

 district of Bracamoras, Humboldt and Bonpland. 





Befala (more specierum plurimarum) calyce suhduplo longioray siaminibus h 



lis 



22 



P. RIGIDA, Benth. in Book. Journ. Bot. iv. 338. Inermis, subglabra. P 



3-6-jugse ; foliola falcata, nitida, convexiuscula, 2-5-nervia, costa submarginali, 4 

 Spicge 1-1^-pollicares. Semina anguste alata.— -F/. Bras. Mi 



Mart. ! Syst. Mat 



Bab. Subtropical and extratropical Soutb America: Brazil, prov. Rio Grande do Sol 



and Paraguay 



:' 



3 c2 



