Siri von Reis Altschul established in 1964 a revision of taxonomy of Anandenanthera genus, saying it consisted of A. peregrina and A. colubrina, each one with two varieties. It uses morphology of reproductive structures (flowers and pods) and geographic distribution to separate species and varieties.

This work is published on Contributions of the Gray Herbarium of Harvard University paper nº 193

http://www.huh.harvard.e...aries/graypub/GPUB6.html

The paper can be bought for $15 at the Grey Herbarium of Harvard University (in Cambridge, if someone could get there and get these informations for free... hehe)

http://www.huh.harvard.e...ies/graypub/GRAYPUB.html

I'm sure very useful and detailed information is there.

I found this citation on the book Legumes of Bahia:

"von Reis Altschul in Contributions to the Grey Herbarium 193: 1-65 (1964) (revision of the genus includinh a key to the taxa).
2 species in West Indies and northern South America

1 Anthers eglandular in bud; involucre or scar 3/4 of the way up the peduncle; legume scurfy to verrucose, and dull...................... A. peregrina
1 Anthers glandular in bud; involucre just below the recptacle; legume smooth to reticulate, and nitid (A. colubrina):
2 Leaflets linear with the mid-vein more proeminent than secondary venation; inflorescences paniculate in the branch apices; heads whitish in bud involucre with tips extended and noticeable below the immature head; legume very elongated, regularly contracted................... var. colubrina
2 Leaflets dilated in the middle, with proeminent secondary venation; inflorescences fasciculate in the leaf axils and subterminal, or racemose in the branch apices; heads not whitish in bud; involucre a narrow band, obscure; legume usually relatively short and wide, often irregularly contracted................... var. cebil"

A little glossary with some botanical terms:

Eglandular: that doesn't has secretive structures (glands);
Anther: adroecium (masculine part of the flower) structure that contains the polen;
Leaflet: each subdivision of a compound leaf, that resembles an entire leaf, bud doesn't has an axillary bud.

Glandular: that has secretive structures (glands);
Legume: the fruit of the Fabaceae family;
Dull: that doesn't show brightness;
Peduncle: the basis of the inflorescence;
Reticulate: the surface resembles a reticulum (network);
Scurfy: that has a rough and irregular surface;
Venation: veins arrangement pattern;