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Pakistan | Family List | Aizoaceae

Portulaca Linn., Sp. Pl. 445. 1753. Gen. P1. ed. 5. 204. 1754; DC., Prodr. 3:351. 1828; Bentham & Mueller, Fl. Austral. 1:168. 1863; Thiselton Dyer in Hook. f., Fl. Brit. Ind. 1:246. 1872; Pax & Hoffm. in Engler & Prantl, Pflanzenfam. 16 c:246. 1934; von Poellnitz, Feddes Rep. 37:240. 1934; S. M. Walters in Tutin et al, Fl. Europ. 1:114. 1964.

Portulaca tuberosa

Credit: Azmat

  • Lamia Vand.
  • Lamia* Endl.
  • Meridiana Linn. f.

    Diffuse, annual or perennial, often trailing or ascending, usually glabrous and fleshy herbs. Leaves simple, alternate or opposite, sometimes subopposite; the uppermost crowded to form a sort of involucre below the flowers, flat or terete-semiterete, fleshy; stipules scarious or modified into a bunch of hairs, rarely absent. Inflorescence a terminal fasciculate cyme or flowers solitary terĀ¬minal, surrounded by a whorl of leaves. Flowers bisexual, actinomorphic, sessile, perigynous, usually 5-merous, showy, variously coloured; bracts entire or modified into hairs. Sepals 2, fused at the base to form a very short tube partly adnate to ovary and the lobes caducous. Petals 4-6, free or united at the base, inserted on rim of calyx tube, marcescent. Stamens 4-many, free or united at the base, inserted on rim of calyx tube and adnate to petals, rarely epipetalous. Carpels usually more than 3, syncarpous; ovary ovoid, half adnate to calyx, semi-inferior; ovules many, campylotropous; style with 3-8 elongated and radiating stigmas. Fruit brittle with thin membranous wall, subglobose to globose or oblong-conical, unilocular capsule, with transverse (circumscissile) dehiscence. Seeds numerous, minute, reniform or lenticular, testa shining, aculeate, tuberculate or somewhat papillate.

    About 200 species, chiefly American but also distributed in other tropical and subtropical regions of the world.

    1 Leaves opposite. Flowers solitary terminal. Petals 4   Portulaca quadrifida
    + Leaves alternate or subopposite, Flowers in terminal clusters. Petals 5 or more   (2)
    2 (1) Leaves usually spathulate or obovate-oblong. Stipular hairs absent or very minute. Flowers Surrounded by a 4-leaved involucre. Sepals keeled. Stamens 7-12   Portulaca oleracea
    + Leaves linear to linear-oblong. Stipular hairs copious. Flowers surrounded by more than a 4-leaved involucre. Sepals not keeled. Stamens 20 or more   (3)
    3 (2) Root tuberous, somewhat fusiform. Petals lanceolate. Capsule subglobose, apiculate. Seeds lenticular   Portulaca tuberosa
    + Root not tuberous. Petals obovate. Capsule oblong or ovoid. Seeds reniform   (4)
    4 (3) Leaves subterete, linear-oblong, Flowers 2-5 cm across. Petals 5 or more, pale brown or yellow spotted at the base. emarginate. Seeds metallic grey or greyish-black   Portulaca grandiflora
    + Leaves linear-lanceolate. Flowers 1 cm across. Petals only 5, not spotted at the base, obtuse. Seeds dark brown to black   Portulaca pilosa

    Lower Taxa

    Related Synonym(s):


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