Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Cressa truxillensis HBK.
- Family: Morning-glory (Convolvulaceae)
- Flowering: May-October
- Field Marks: This gray-hairy, usually sprawling, herb has solitary white flowers borne in the axils of the upper leaves, with the petals and sepals about the same length.
- Habitat: Moist alkaline and salty habitats.
- Habit: Perennial herb with a slender taproot.
- Stems: Upright or lying flat, much branched, gray-hairy, up to 8 inches long.
- Leaves: Alternate, simple, oblong to ovate, up to 1/2 inch long, up to 1/3 inch wide,
rounded or somewhat pointed at the tip, tapering to the usually sessile base, gray-hairy,
- Flowers: Solitary in the axils of the upper leaves, subtended by bracteoles; stalks very short to 1/3 inch long.
- Sepals: 5, green, united below, hairy, 1/6-1/4 inch long, the lobes ovate.
- Petals: 5, white, united below into a short tube 1/6-1/4 inch long, the lobes shorter, ovate, spreading or turned downward.
- Stamens: 5, exserted beyond the petals.
- Pistils: Ovary superior, hairy; styles 2.
- Fruits: Capsules ovoid, 1/4-1/3 inch long, hairy, usually 1-seeded; seed ovoid, dull brown.
- Notes: This is a highly variable species with some plants upright and others lying on the ground.
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