Senna rizzinii H.S. Irwin & Barneby (1982: 174–175)

Gomes, Aureliana Santos, Rodrigues, Erimágna De Morais, Moura, Débora Coelho, Melo, José Iranildo Miranda De, Ribeiro, Rayane De Tasso Moreira & Queiroz, Rubens Teixeira De, 2022, Fabaceae Lindl. in a Conservation Unit in the Semi-Arid Region of Paraíba, Brazil, Phytotaxa 555 (1), pp. 17-41 : 35-36

publication ID

https://doi.org/ 10.11646/phytotaxa.555.1.2

DOI

https://doi.org/10.5281/zenodo.6886153

persistent identifier

https://treatment.plazi.org/id/038E87C1-9943-5F39-04DF-E908FAEC71E1

treatment provided by

Plazi

scientific name

Senna rizzinii H.S. Irwin & Barneby (1982: 174–175)
status

 

34. Senna rizzinii H.S. Irwin & Barneby (1982: 174–175) View in CoL . ( Fig. 4g View FIGURE 4 )

Shrubs scandent, branches tomentose, inermous. Nectary rachis, stipitate. Stipules lateral, acicular. Leaves paripinnate, 4–foliolate, leaflets opposite, lanceolate, venation brochidodromous, translucid punctuation absent. Inflorescence raceme, axillary, terminal. Flowers pedicillate, zygomorphic, diplostemonous; calyx dialysepalous, sepals 5, corolla dialypetalous, yellow, petals 5; androecium dialystaminous, heterodinamous, anthers poricidal; ovary superior, sessile, pluriovulate. Fruit berry, stipitate, linear, cylindric, margin straight, epicarp tomentulose, brown. Seeds obovate, plane, coat black, hilum basal.

Examined material:— BRAZIL. Paraíba: Maturéia, Pico do Jabre , 1.000 m elev., 03 May 2019, fl., Aureliana Gomes 2018 ( HACAM) .

Distribution and ecology:—It is restricted to the Northeast of Brazil (AL, BA, CE, MA, PB, PE, PI, RN, SE), associated with the phytogeographic domain of the Caatinga (Queiroz 2009; BFG 2018).

Phenology:— Registered with flowers in May.

Taxonomic discussion:— Senna rizzinii can be recognized, mainly, by the shrubby habit, inermous branches, lateral stipules, terminal raceme, zygomorphic flowers with yellow corolla and bacoid fruits. It resembles Senna macranthera morphologically, but can be distinguished by the ovate bracts in S. rizzinii vs. linear bracts in S. macranthera .

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Fabales

Family

Fabaceae

Genus

Senna

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