Senna alexandrina Mill.
  • Gard. Dict. ed. 8 : n.º 1 (1768)


Cite taxon page as 'WFO (2023): Senna alexandrina Mill. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000164723. Accessed on: 24 Mar 2023'

General Information

Ours erect-ascending, precociously flowering, ultimately suffrutescent herbs at anthesis 3-10 (in Paleotropics potentially -30) dm, sparsely strigulose with fine, truly appressed straight hairs up to 0.15-0.3 mm, the foliage pallidly olivaceous, concolorous or yellowish above, the axillary and finally subterminal loose racemes surpassing their lf.Stipules ascending or spreading lance-subulate 1.5-3 mm, at base dilated on side further from petiole, there ±1 mm wide, early dry deciduous.Lvs 5-16 cm; petiole including wrinkled but not much dilated pulvinus 1-2.5 cm, at middle 0.5-1.2 mm diam, shallowly sulcate ventrally; rachis (2.5-)3-13 cm; petiolar glands 0 (but spicules present between lfts); pulvinules ±1 mm; lfts (3-)4-8 pairs, ± accrescent distally, in outline lanceolate acuminulate or acute mucronulate, the longest (distal or penultimate) ±2.5-5 x 0.5-1 cm, 4-7 times as long as wide, at base subsymmetrically cuneate, the margin plane, the midrib and 3-5(-6) pairs of narrowly ascending secondary veins prominulous on both faces, an open irregular tertiary venulation raised or not.Racemes (7-)10-30-fld, the fl-buds elevated well beyond the 2-4 simultaneously open flowers, the elongating axis together with peduncle becoming 1-2 dm; bracts membranous or membranous-margined, yellowish or fuscous, obovate 5-7 x 4.5-6 mm, at base shortly auriculate on both sides, enveloping the young fl-buds, cast off as the pedicel elongates; pedicels at and after anthesis 1-2(-2.5) mm, surmounted by a narrowly funnelform hypanthium 2.5-4 mm (easily and often in the past mistaken for part of pedicel); fl-buds ascending, obliquely obovoid or semi-obovoid obtuse; sepals submembranous fuscous or yellowish pallid-margined, glabrous or microscopically papillose-puberulent, in outline obovate or oblong- oblanceolate and of subequal length ±9-11 mm; petals glabrous yellow or orange- yellow drying stramineous or whitish brown-veined, in outline obovate or oblong- obovate beyond the short claw, ±13.5-15 mm; androecium glabrous, the 3 adaxial members minute or sterile (anthers 1.1-2 mm), the filaments of 4 median ones 2-2.6 mm, of 2 latero-abaxial ones 2.2-2.5 mm, of the centric abaxial one 3.5-4 mm, the anthers of 4 median and the centric abaxial one 3.3—4.3 mm, straight or almost so, of the 2 latero-abaxial lunately incurved, narrowly lance-attenuate 9.5-10 x 1.3-1.5 mm, at base inequilaterally sagittate, all 7 fertile anthers at truncate apex bluntly 2-umbonate on ventral side and 2-porose on dorsal one; ovary densely strigulose; style glabrous linear-filiform, evenly incurved from base, sometimes a trifle thickened distally, at or just below the obliquely terminal stigmatic cavity 0.2-0.25 mm diam; ovules 6-10.Pod spreading or declined stipitate, the true stipe (beyond orifice of hypanthium) 2.5-3 mm, the broadly oblong or oblong-elliptic, straight or gently incurved, piano-compressed body with us 4-5.5 x 1.6-1.7 (in paleotropic races potentially up to 7 x 2.6) cm, rounded at both ends and at base abruptly cuneately contracted into stipe, the style-base becoming infraterminal, the thinly papery dull or moderately lustrous valves livid-brown becoming paler along the slender sutures, slightly elevated but not longitudinally crested over ripe seeds, the cavity dilated only along middle and there narrowly but completely membranous-septate; dehiscence inert but complete, along both sutures: seeds compressed parallel to the valves, in outline oblong-paddle-shaped, at apex truncate-emarginate, 5.2-6.2 x 3-3.6 mm, the ivory-stramineous testa sharply elaborately sinuous-rugulose overall, the oblanceolate areole 1.5-2.4 x 0.4-0.5 mm engraved into a vertical ridge at proximal end of seed; n = 14 (?13).—Collections: 30 (4 neotropical).—Fig. 10 (androecium), 13 (pod, seed), both under synonym angustifolia.

  • Provided by: [C].Memoirs of the New York Botanical Garden
    • Source: [
    • 2
    • ]. 

    Morphology

    Stem: indumentum sparsely pubescent/strigullose. Leaf: stipule subulate/lanceolate; petiole smaller than 5 cm; foliar rachis smaller than 5 cm/between 11 cm and 20 cm; position nectary extrafloral absent; nectary extrafloral absent; shape of the nectary extrafloral absent; leaflet 4 pairs/5 pairs/between 6 and 10 pairs; form of the leaflet lanceolate; apex of the leaflet acuminate. Inflorescence: bract(s) obovate; type raceme. Flower: symmetry asymmetric; form of the petal centro adaxial obovate; stamen fertile 7. Fruit: pod dehiscent; position erect; form of the fruit plane; externally depressed between seed. Seed: number of the series 1 seriate.

  • Provided by: [A].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    • Source: [
    • 1
    • ]. 

    Caule: indumento esparsamente pubescente(s)/estriguloso(s). Folha: estípula(s) subulada(s)/lanceolada(s); pecíolo(s) menor que 5 cm; raque foliar menor que 5 cm/entre 11 cm e 20 cm; posição nectário(s) extrafloral(ais) ausente(s); nectário(s) extrafloral(ais) ausente(s); formato dos nectário(s) extrafloral(ais) ausente(s); folíolo(s) 4 pares/5 pares/entre 6 e 10 pares; forma dos folíolo(s) lanceolado(s); ápice(s) dos folíolo(s) acuminado(s). Inflorescência: bráctea(s) obovada(s); tipo racemo(s). Flor: simetria assimétrica(s); forma da pétala(s) centro adaxial obovada(s); estame(s) fértil(eis) 7. Fruto: legume(s) deiscente(s); posição ereto(s); forma dos fruto(s) plano(s); externamente depresso(s) entre semente(s). Semente: número de série 1 seriada(s).

  • Provided by: [A].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    • Source: [
    • 1
    • ]. 

    Tallo: indumento esparsamente pubescente(s)/estriguloso(s). Hoja: estípula(s) subulada(s)/lanceolada(s); pecíolo(s) menor que 5 cm; raquis foliar menor que 5 cm/entre 11 cm y 20 cm; posición nectário(s) extrafloral(es) ausente(s); nectário(s) extrafloral(es) ausente(s); forma de los nectário(s) extrafloral(es) ausente(s); foliolo(s) 4 páreas/5 páreas/entre 6 y 10 páreas; forma de los foliolo(s) lanceolado(s); ápice(s) de los foliolo(s) acuminado(s). Inflorescencia: bractea(s) obovada(s); tipo racimo(s). Flor: simetria assimétrica(s); forma de la pétala(s) centro adaxial obovada(s); estambre(s) fértil(es) 7. Fruto: legume(s) deiscente(s); posición erecto(s); forma de los fruto(s) plano(s); externamente depreso(s) entre semilla(s). Semilla: número de serie 1 seriada(s).

  • Provided by: [A].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    • Source: [
    • 1
    • ]. 

    Distribution

    Waysides and waste places in the lowlands, adventive and naturalized in Hispaniola (s.-centr. Dominican Republic and Haiti) and in the Balsas valley in s. Mexico, cultivated and possibly casual elsewhere in the New World; native of grasslands and deserts of Tropical Africa mostly n. of the Equator, extending e. through Near East to the plains of peninsular India.—Fl. in the West Indies year around.

  • Provided by: [C].Memoirs of the New York Botanical Garden
    • Source: [
    • 2
    • ]. 

    Distribution Map

     
    • Native distribution
    Found in
    • Southern America Brazil Bahia
    • Pernambuco
    • Rio Grande do Norte

      Bibliography

     Information From

    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    https://floradobrasil.jbrj.gov.br
    The Brazilian Flora Group (2018): Brazilian Flora 2020. http://dx.doi.org/10.1590/2175-7860201869402 Dataset/Checklist: https://ckan.jbrj.gov.br/dataset/thebrazilfloragroup_feb2018
    • A Group Brazil Flora, REFLORA Program
    Fabaceae
    http://www.worldfloraonline.org/organisation/Fabaceae
    World Flora Online Data. 2022.
    • B CC0 1.0 Universal (CC0 1.0).
    Memoirs of the New York Botanical Garden
    https://www.nybg.org/
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    World Flora Online Consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2017.
    • D CC0 1.0 Universal (CC0 1.0).
    Global Tree Search
    https://tools.bgci.org/global_tree_search.php
    BGCI. 2022. GlobalTreeSearch online database (version 1.6). Botanic Gardens Conservation International. Richmond, UK. DOI: 10.13140/RG.2.2.34206.61761 Available at https://tools.bgci.org/global_tree_search.php. Accessed on (15/06/2022).
    • E Botanic Gardens Conservation International