Monographs Details: Cassia caiapo H.S.Irwin & Barneby
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1978. Monographic studies in Cassia (Leguminosae, Caesalpinioideae). III. Sections Absus and Grimaldia. Mem. New York Bot. Gard. 30: 1-300.
Description:Latin Diagnosis - Cassia caiapo Irwin & Barneby, sp. nov., C. lomatopodae notulis multis similis et certe affinis, ab ea imprimis petiolo communi ventraliter angustissime obtuse 2-costato (nec 2- alato) foliolisque (2-)3—4 (nec 1 — 3)-jugis ovatis (nec oblanceolato-obovatis) margine planis (nec revolutis), C. labouriaeae xylopodio robusto, foliolis subduplo majoribus (2.5-)3—5 (nec 1.5-2.2) cm longis, insuper ab ambabus adspectu toto abstans.
Distribution and Ecology - Cerrado, near 1000 m, known only from the type-locality in Serra do Caiapo near the s.-w. corner of Goias. - Fl. XI-XII.
BRAZIL. Goias: Serra do Caiapo, ± 50 km s. of Caiaponia on road to Jatai, 17° 12' S, 51° 47' W, 26.X.1964 (in bud), Irwin & Soderstrom 7368.
While only incompletely known from specimens in young flower-bud, C. caiapo is confidently described as a new species related to C. lomatopoda and C. labouriaeae, both of which it resembles in pubescence and texture of the foliage. It is perhaps closest to C. labouriaeae, known only from Sao Paulo, but differs in the presence of a stout xylopodium in place of a shallow, unmodified root, in the much larger leaflets, glabrous buds, and very probably in larger flowers. The oblanceolate to narrowly obovate leaflets of C. lomatopoda, subsessile on widely wing-margined leaf-stalks, are so different from the ovate-elliptic, petiolulate leaflets and unwinged leafstalk of C. caiapo that there can be no possibility of confusing the two. The type-locality of C. caiapo, on the headwaters of Rio Claro, a western affluent of Rio Paranaiba rising close to the Goias-Mato Grosso boundary, lies nearly 400 km distant northwestward from the nearest known station for C. lomatopoda.
The epithet caiapo commemorates the Indian people inhabiting parts of Mato Grosso and Goias in pre-Columbian times.
Goiás Brazil South America
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