Pontederiaceae

Description

Herbaceous aquatic annuals or perennials, rooted in mud or free-floating. Stems of two types, vegetative and flowering; vegetative stem indeterminate, containing many leaves, glabrous; flowering stem determinate, containing a single leaf, spathe, and terminal infloresence. Leaves alternate, composed of a strongly sheathing base, petiole (excluding sessile leaves), and lamina; stipules marcescent, transparent, truncate at apex, sheathing, opposite petiolate leaf base, or absent (on species with only sessile leaves). Inflorescence a panicle, spike, or monoflorous; peduncle glabrous to glandular-pubescent, subtending spathe bract-like, folded, glabrous, with an acute to caudate apex. Flowers trimerous, bisexual, zygomorphic, sessile, glandular-pubescent or pilose; perianth consisting of six petaloid, oblong to oblanceolate tepals, basally fused into a tube; stamens 6, adnate to the perianth, filaments pubescent with multicellular or glandular hairs, the anthers rounded; ovary superior, trilocular, with 1 or 3 locules developing to maturity, placentation parietal or basal, ovules one to many, style pubescent with multicellular hairs or glabrous, stigma entire or 3-lobedwith single-celled hairs. Fruit a many-seeded capsule with persistent unmodified perianth or a nutlet with thickened, ridged perianth; seeds longitudinally winged or smooth.

Distribution

American temperate zone: present Guianas: present tropics: present
Six genera and about 33 species of the tropics and American temperate zone; in the Guianas 8 species in 2 genera.

Synonymy

Pontederiaceae sec. CHARLES N. HORN - Pontederiaceae in Charles N. Horn, Paul J.M. Maas, Hiltje Maas-van de Kamer & A.R.A. GORTS-VAN RuN, FLORA OF THE GUIANAS, Series A: Phanerogams Fascicle 15 182. XYRIDACEAE, 197. PONTEDERIACEAE, 198. HAEMODORACEAE. 1994

    Specimens

    CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
    Broadway, W.E. 943
    Citation: Broadway, W.E. 943.

    Broadway, W.E. s.n.
    Citation: Broadway, W.E. s.n..

    Cremers, G. 5226
    Citation: Cremers, G. 5226.

    Cremers, G. 9582
    Citation: Cremers, G. 9582.

    Cremers, G. 9585
    Citation: Cremers, G. 9585.

    Cremers, G. 9587
    Citation: Cremers, G. 9587.

    Descoings, B. & C. Lou 20022
    Citation: Descoings, B. & C. Lou 20022.

    Feuillet, C. 1369
    Citation: Feuillet, C. 1369.

    Feuillet, C. 1412
    Citation: Feuillet, C. 1412.

    Gabriel, M. s.n.
    Citation: Gabriel, M. s.n..

    Granville, J.J. de 2343
    Citation: Granville, J.J. de 2343.

    Granville, J.J. de 937
    Citation: Granville, J.J. de 937.

    Granville, J.J. de 938
    Citation: Granville, J.J. de 938.

    Granville, J.J. de et al. 10051
    Citation: Granville, J.J. de et al. 10051.

    Granville, J.J. de et al. 10055
    Citation: Granville, J.J. de et al. 10055.

    Grenand, P. 1002
    Citation: Grenand, P. 1002.

    Grenand, P. 1887
    Citation: Grenand, P. 1887.

    Grenand, P. 1887
    Citation: Grenand, P. 1887.

    Guyana, Republic ofAnderson, CYV. 620
    Citation: Guyana, Republic of, Anderson, CYV. 620.

    Guyana, Republic ofAppun, C.F. 2100
    Citation: Guyana, Republic of, Appun, C.F. 2100.

    Guyana, Republic ofAppun, C.F. 2370
    Citation: Guyana, Republic of, Appun, C.F. 2370.

    Guyana, Republic ofBeckett, J.E. 8488
    Citation: Guyana, Republic of, Beckett, J.E. 8488.

    Guyana, Republic ofCook, C.D.K. 197
    Citation: Guyana, Republic of, Cook, C.D.K. 197.

    Guyana, Republic ofCook, C.D.K. 205
    Citation: Guyana, Republic of, Cook, C.D.K. 205.

    Guyana, Republic ofCowan, R.S. & T.R. Soderstrom 2228
    Citation: Guyana, Republic of, Cowan, R.S. & T.R. Soderstrom 2228.

    Guyana, Republic ofDahlgren, B.E. & A.C. Persaud s.n.
    Citation: Guyana, Republic of, Dahlgren, B.E. & A.C. Persaud s.n..

    Guyana, Republic ofDavis, D.H. 238
    Citation: Guyana, Republic of, Davis, D.H. 238.

    Guyana, Republic ofde la Cruz, J.S. 2967
    Citation: Guyana, Republic of, de la Cruz, J.S. 2967.

    Guyana, Republic ofde la Cruz, J.S. 2980
    Citation: Guyana, Republic of, de la Cruz, J.S. 2980.

    Guyana, Republic ofde la Cruz, J.S. 3083
    Citation: Guyana, Republic of, de la Cruz, J.S. 3083.