Flora of North America species comparison

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Ludwigia sect. Seminudae
Habit Herbs, annual or perennial, or shrubs, often forming pneumatophores when submerged.
Stems

erect or ascending, terete or angled.
Leaves

alternate.
Flowers

(4 or)5 or 6(or 7)-merous;

petals present, orange-yellow;

stamens 2 times as many as sepals;

pollen shed in polyads.
Capsules

subcylindric [cylindric], angled or subterete [terete], with relatively thin walls, irregularly dehiscent.
Seeds

in 1 row per locule, embedded in horseshoe-shaped segment of endocarp from which it easily detaches, raphe inconspicuous.
2n

= 32, 48, 64, 80.

Ludwigia sect. Seminudae
Distribution
c United States; e United States; Mexico; Central America; South America; West Indies; Africa; Indian Ocean Islands (Madagascar)
Discussion

Species 5 (1 in the flora).

Section Seminudae consists of a polyploid complex of five species (P. H. Raven and W. Tai 1979), one [hexaploid (n = 24) L. africana (Brenan) H. Hara] endemic to Africa, two [hexaploid (n = 24) L. dodecandra (de Candolle) Zardini & P. H. Raven and chromosomally unknown L. quadrangularis (Micheli) H. Hara] endemic to Central America and South America, and two widely distributed multiploids in the New World but present also in Africa. Of the latter, L. affinis (de Candolle) H. Hara (n = 16, 24) occurs only in a small area of West Africa, probably as a recent introduction from South America (Raven 1963[1964]), whereas L. leptocarpa (n = 32, 40) is widespread and possibly native in sub-Saharan Africa. This section is distinctive among the diplostemonous taxa in having uniseriate seeds embedded in loose segments of endocarp. However, sect. Seminudae so far is poorly resolved by molecular analysis (Liu S. H. et al. 2017).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Ludwigioideae > Ludwigia
Subordinate taxa
Name authority P. H. Raven: Reinwardtia 6: 334. (1964)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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