Flora of North America species comparison

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Cressa

alkali weed, rosinweed
Habit Perennials or subshrubs, rhizomatous.
Stems

decumbent to erect, seldom, if ever, mat-forming, glabrate or hirsute to ± sericeous.
Leaves

petiolate or sessile;

blade usually elliptic, lanceolate, ovate, or ovate-lanceolate, sometimes scalelike, 1–10 mm, surfaces glabrous or hirsute to ± sericeous.
Inflorescences

flowers usually solitary, sometimes distally clustered, bracteolate.
Flowers

sepals elliptic, oblong, obovate, or ovate, 3–6 mm;

corolla white [rose], salverform, 5–7 mm, limb 5-lobed, lobes spreading to reflexed, ovate;

styles 2, distinct;

stigmas capitate.
Fruits

capsular, ovoid, dehiscence valvate.
Seeds

1(–2)[–4], ovoid, glabrous, surfaces smooth or reticulate.
x

= 14.

Cressa
Distribution
from FNA
HI; w United States; c United States; Mexico; South America; Asia; Indian Ocean Islands (Indonesia); Australia
[BONAP county map]
Discussion

Species 4 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems usually leafless at anthesis; leaves: blade ovate, scalelike, 1–4 × 1 mm, surfaces glabrous.
C. nudicaulis
1. Stems leafy at anthesis; leaves: blade elliptic, lanceolate, or ovate-lanceolate, 3–10 × 1–4 mm, surfaces hirsute to ± sericeous.
C. truxillensis
Source FNA vol. 14. Treatment author: Daniel F. Austin†.
Parent taxa Convolvulaceae
Subordinate taxa
C. nudicaulis, C. truxillensis
Name authority Linnaeus: Sp. Pl. 1: 223. (1753): Gen. Pl. ed. 5, 104. (1754)
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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