182 University of California Piiblications in Botany [Vol. 10 



utrinque glabris, oblongo-ovatis 4-11 cm. longis, 1.5-4.5 cm, latis, 

 apice obtuse acuminatis : calyce 5-sinuato-dentato, albo-sericeo- 

 pubescenti ; vexillo suborbiculato, ca. 12 mm. lato, apice alte emar- 

 ginato, flavido-punctato, dorso minute pubescenti, ochroleuco, ungui 

 ca. 2.5 mm. longo ; stamine vexillari basi libero ; stylo curvato ; alis 

 flavido-punctatis violaceo-tinctis ; ovario pubescenti, 5-10-ovulato ; 

 legumine immature, oblongo, mcmbranaceo, glabro, 1-3-spermo, ca. 

 8 cm. longo, 1.8 cm. lato. 



Three of the four collections are leafless. Collected at Remulatero, 

 Vera Cruz. Nos. 8591 and 8588. Type, Herb. Univ. Calif. No. 20596. 



Pithecolobium leucospermum, sp. nov. 



Ramis brunneis lenticellis praeditis, flexuosis: foliis bipinnatis, 

 pinnis 3-4-jugis ; foliolis 8-10-jugis, oblongis, acutis, basi inaequalibus, 

 utrinque paullo pubescentibus, rachidibus albo-pubescentibus, stipulis 

 deciduis vel rare spinis validis instructis : floribus in capita congestis ; 

 jiedunculis pubescentibus, 1-2 cm. longis, 1-2-axillaribus, glandulis 

 plerumque deficientibus ; calyce ca. 2 mm. longo, paullo pubescenti, 

 breviter dentato; corolla ochroleuca, ca. 5 mm. longa, paullo 

 pubescenti, apice breviter 5-loba; staminibus longe exsertis, basi ca. 

 2 mm. connatis ; legumine coriaceo, fusco, glabro, paullo f alcato, usque 

 ad 20-spermo, 2-valvi, ca. 15 cm. longo, 7 mm. lato, intus septato ; 

 seminibus ovatis, pallide albis, nitidis ; f uniculo filif ormi, contorto. 



The egg-like seeds are different from those of most Mexican species 

 of the genus. Collected in a barranca near Cameron, Vera Cruz. 

 No. 8717. Type, Herb. Univ. Calif. No. 206765. 



Mimosa chaetocarpa, sp. nov. 



Fruticosa inermis: caulibus cinereis setosis: pinnis unijugis; 

 petiolis ca. 8 mm. longis, hirsutis ; stipulis lanceolatis ca. 3 mm. longis, 

 setosis ; foliolis pinnae 16-22 oblongo-obliquis, margine parum setosis, 

 utrinque breviter setosis, apice obtusis mucronatis : floribus ut videtur 

 siccatis purpureis, in capitulum congestis, 4-meris; pedunculis ca. 2 

 cm. longis, hirsutis, axillaribus: legumine juveni oblongo ca. 15 mm. 

 longo, 5 mm. lato, apice mucronato, utrinque longe denseque setoso, 

 setis stramineis albescentibus, ca. 3 mm. longis, 2-3-spermis. 



The crowded densely setose pods are very conspicuous. Only 

 fruiting specimens with remnants of old dried flowers were collected. 

 Collected at Cameron, Vera Cruz. No. 8600. Type, Herb. Univ. 

 Calif. No. 206733. 



