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

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

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1982] CASSIINAE—SENNA 361<br />

Pods "obtenus dans le jardin de I'Hotel des Etrangers a Nice en 1938," G! are ostensibly<br />

authentic and the accompanying plant grown at Geneva in IX. 1839 appears derived from<br />

them.—Equated by Bentham, 1871, p. 527, with C. laevigata, but the protologue and cited<br />

specimen indicates S. x floribunda.<br />

Adipera arsenei Britton & Rose, N. Amer. Fl. 23(4): 242. 1930.—"Fort Guadalupe, Puebla, 2,180<br />

meters altitude, Se<strong>pt</strong>ember 30, 1906, Brother G. ArseneV'—Holotypus, US! clastotypus<br />

+ photo, <strong>NY</strong>!<br />

Adipera bicolor Britton & Rose, N. Amer. Fl. 23(4): 242. 1930.—"Near Durango City, Durango,<br />

1896, E. Palmer 596a.''—Holotypus, presumably from cultivated or naturalized plant, US!<br />

clastotypus + photo, <strong>NY</strong>!<br />

Cassia floribunda sensu Lowe, Man. fl. Madeira 1: 228. 1868.<br />

Habitally simUar to S. se<strong>pt</strong>emtrionalis, but the hts (at least when young), pedicels<br />

and base of ovary finely pUosulous with weak incurved or subappressed<br />

hairs up to 0.2-0.7 mm, the inflorescence often corymbose-paniculate and ±<br />

exserted from fohage.<br />

Lvs (7-)9-16(-18) cm, the petiole 18-34 mm, the rachis (2.5-)3-8(-9.5) cm, hs<br />

longest interfoholar segment 12-25 mm; hts 4-5 pairs, the distal pair lance- or<br />

oblong-elh<strong>pt</strong>ic, abru<strong>pt</strong>ly acute or acuminulate 3-7 x 1-2 cm, 2.5^(^.2) times as<br />

long as wide, at base inequilateral, rounded or subcordate on proximal and cu­<br />

neate on distal side, the 8-14 pairs of secondary veins not or scarcely visible<br />

above, the tertiary venulation scarcely prominulous beneath.<br />

Racemes 4-15(-20)-fld, their axis with peduncle (2-)3.5-12 cm; vexillar petal<br />

14-23 mm; ovary puberulent; ovules 50-64.<br />

Pod like that of S. se<strong>pt</strong>emtrionalis externally, the body (5-)6-7.5 x 0.7-0.9<br />

cm, terete or somewhat laterally compressed, the seed-locules varying from irregularly<br />

2- to strictly 1-seriate, the orientation of the seeds ± haphazard, some<br />

turned with broad faces to the se<strong>pt</strong>a, others obhquely to the valves.—Collec­<br />

tions: 20.<br />

Open rocky and disturbed habitats, sometimes on pedregal, ±1800-2300 m,<br />

primarUy with or near the parent spp., but fuUy fertile and forming independent<br />

populations, local around the s. and s.-e. margins of the Mexican Plateau from<br />

n.-w. Michoacan to Puebla, n. to s.-e. San Luis Potosi, cultivated in Spain about<br />

1800 and thence diffused in horticulture; reports from Durango, Barbados and<br />

elsewhere outside the common range of the parent species are from cultivated or<br />

weedy stock.—Fl. in Mexico mostly VI-X.<br />

The two first monographers of Cassia sens, lat., Colladon in consultation with<br />

his professor A. P. DeCandolle (1816) and Vogel (1837), agreed in recognizing<br />

the two species C. laevigata and C. floribunda, obviously close relatives but<br />

seemingly different in outhne of leaflets, in pubescence, in incidence of petiolar<br />

glands, in archhecture of the inflorescence, or in some combination of of these<br />

characters. Both species were then known principaUy from specimens cultivated<br />

in Europe; indeed, exce<strong>pt</strong> for the Mexican type-collection of C. elegans H.B.K.,<br />

there were no exact data about dispersal in the wUd state. By 1870-1871 Bentham<br />

had evidence that C. laevigata, characterized by broadly and subsymmetrically<br />

lance- or ovate-acuminate, truly glabrous leaflets, was an American senna widely<br />

dispersed as a circumtropical weed; but C. floribunda, dhfering in its oblong-<br />

eUi<strong>pt</strong>ic, basaUy inequUateral, variably pubescent leaflets and corymbose-panicu­<br />

late rather than largely lateral racemes, remained a horticultural oddity which<br />

Bentham provisionally interpreted as a plurhoUolate variety of C. corymbosa.<br />

Here the matter rested untU De Wit (1955, I.e.) summarily equated C. floribunda<br />

with C. laevigata and, foUowing the dictates of priority, ado<strong>pt</strong>ed the eariier Qp-<br />

ithet floribunda. Under this name De Wh reaUy described and discussed only

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