384 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Corolla copiously pubescent, usually purple. 



Corolla 4 to 4.5 mm. long 10. C. eriophylla. 



Corolla 6 to 7 mm. long. 



Leaflets usually 8 to 10 pairs, oblong__ll. C. calif omica. 

 Leaflets usually 12 to 20 pairs, narrowly oblong. 



Pods densely pubescent with spreading hairs ; pinnae 



usuallj' 3 or 4 pairs 12. C. cumingii. 



Pods sparsely pubescent with appressed hairs ; pinnae 



4 to 6 pairs 13. C. peninsularis. 



Leaflets glabrous beneath, but often ciliate. 



Plants low, usually less than 20 cm. high, woody only at the base. 

 Pinnae 2 to 4 pairs ; leaflets oval or broadly oblong, not conspicu- 

 ously if at all ciliate 15. C. reticulata. 



Pinnae 5 to 9 pairs ; leaflets oblong or narrowly oblong, often long- 



ciliate 16. C. humilis. 



Plants usually tall shrubs, often woody throughout. 



Pinnae a single pair in all the leaves ; leaflets very small, oval or 



obovate-oval 19. C. unijuga. 



Pinnae 2 or more pairs in all or most of the leaves (rarely a single 

 pair, the leaflets then oblong). 



Leaflets coriaceous; calyx shallowly dentate 14. C. bijuga. 



Leaflets membranaceous ; calyx deeply lobate. 



Branches quadrangular 22. C. tetragona. 



Branches terete. 



Pinnae 2 pairs in most of the leaves. 



Leaflets usuaUy 10 to 13 pairs, oblong or narrowly oblong. 



23. C.oaxacana. 

 Leaflets usually 5 to 7 pairs, oval to broadly oblong. 



24. C. formosa. 

 Pinnae 3 or more pairs in most of the leaves. 



Leaflets usually 8 to 15 pairs or more, 2 to 6 mm. wide. 



25. C. portoricensis. 

 Leaflets 3 to 6 pairs, 10 to 20 mm. wide 26. C. capillata. 



1. Calliandra laevis Rose, Contr. U. S. Nat. Herb. 5: 194. 1899. 

 Sinaloa and Tepic; type from Colomas, Sinaloa. 



Shrub ; leaflets 4, lanceolate, 4.5 to 9 cm. long, bright green, glabrous. 



2. Calliandra canescens (Schlecht. & Cham.) Benth. Loud. Journ. Bot. 3: 96. 



1844. 

 Inga canescens Schlecht. & Cham. Linnaea 5: 592. 1830. 

 CalUandra inirtmsU T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 180. 1915. 

 Veracruz and Oaxaca ; type collected near Pueute del Key. Guatemala. 

 Shrub, 1.5 to 2.5 meters high ; leaflets 1 to 3.5 cm. long ; flowers white. 



3. Calliandra emarginata (Humb. & Bonpl.) Benth. Lond. Journ. Bot. 3: 95. 



1844. 



Itiga emarginata Humb. & Bonpl. ; Willd. Sp. PI. 4 : 1009. 1806. 



Calliandra rupestris T. S. Brandeg. Zoe 5 :199. 1905. 



Tamaulipas and Sonora to Oaxaca and Veracruz; type from Acapulco, Gue- 

 rrero. 



Shrub ; leaflets 2 to 8.5 cm. long, very variable in shape, acute to rounded at 

 apex ; flowers purplish red or greenish ; fruit about 12 nmi. wide. 



The specimens seen exhibit a large amount of variation, and it may be that 

 several species are represented. Without more ample material it seems unwise 

 to make any segregates. 



