Cassiinae pt 1 NY-Botanical_gardens_Vol. 35_1 - Copy.pdf - Antbase

DECEMBER 1982 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 35: 1-454
THE AMERICAN CASSIINAE
A Synoptical Revision
of Leguminosae tribe Cassieae subtribe Cassiinae in the New World
Howard S. Irwin^ and Rupert C. Barneby^
INTRODUCTION
The subtribe Cassiinae is the largest of five which form the tribe Cassieae of
the Leguminosae Caesalpinioideae or of the famUy Caesalpiniaceae. A definition
of the tribe and its component subtribes has been published elsewhere (Irwin &
Barneby in PolhiU & Raven, 1981, pp. 97-106), but for purposes of orientation
it is appropriate to reproduce here a short description of the Cassieae and a key
to its subtribes. Immediately foUowing these wiU be found a diagnostic description
ofthe subtribe that is the subject of this monograph and a key to its three genera.
LEGUMINOSAE tribus CASSIEAE Bronn emend. Irwin & Barneby
Leguminosae tribus Cassieae Bronn, De formis pl. legum. 130. 1822, ex parte, quoad genus
typicum Cas siam L.
Leguminosae tribus Cassieae subtribus Irregulares Bronn, 1822, I.e., ex parte, quoad genus
Cassiam L., caeteris exclusis.
Trees, shrubs, bush-ropes and herbs; leaves paripinnate, imparipinnate (exceptionally
bipinnate), 1-foUolate, phyllodal or 0, sometimes bearing nectariferous
glands on leafstalks or axes of inflorescence, the Ifts either opposite or alternate;
stipules lateral, rarely 0; inflorescence racemose or paniculate, the fls regular,
zygomorphic, or without axis of symmetry, either hermaphrodite, polygamous or
dioecious; bracteoles 0-2; hypanthium cupular, soUd, or 0; sepals (3-)4-5(-6),
free beyond hypanthium rim, imbricate or rarely subvalvate; intrastaminal disc
sometimes (Ceratominae, some Dialiinae) present; petals 0-5; stamens variable
in number, some often reduced to staminodes; anthers either basi- or dorsifixed,
dehiscent by lateral or more often by (sub)terminal shts or pores; poUen 3- or
rarely 4-colporate, exceptionaUy 2-porate; pods highly diverse in form, texture,
dehiscence and dispersal; seedlings commonly epigeous; x = 6, 7, 8, 10, 11, 12,
13, 14.
Key to the Subtribes of tribe Cassieae
1. Inflorescence cymose-paniculate; pod (with rare exceptions) either drupaceous or samaroiddisciform,
when thin-textured commonly winged along one or both sutures, in any case
^ Vice-Chancellor for Resource Development, University Center, Long Island University Greenvale,
New York 11548.
2 Curator, The New York Botanical Garden, Bronx, New York 10458.