Damasonium

Miller

The Gardeners Dictionary (fourth edition) 1: 28. 1754.

Etymology: Greek, ancient name
Synonyms: Machaerocarpus Small
Treatment appears in FNA Volume 22.

Plants perennial, floating-leaved or emersed, glabrous; rhizomes usually absent; stolons absent; corms present; tubers absent. Roots not septate. Leaves: petiole triangular; blade with translucent markings absent, narrow-lanceolate to ovate, base rounded to attenuate, basal lobes absent, margins entire, apex acute. Inflorescences racemes [panicles], of 1–9 whorls, erect, emersed; bracts coarse, apex acute, surfaces smooth. Flowers bisexual, pedicellate; bracts subtending pedicels, lanceolate to ovatelanceolate, much shorter than pedicels, apex acuminate; pedicels ascending to spreading; receptacle flat; sepals erect, without sculpturing, herbaceous; petals white or pink, erose; stamens 6; filaments dilated, glabrous; pistils 6–15, in single ring, radiating in starlike pattern, weakly coherent proximally; ovules 1–2; styles terminal. Fruits longitudinally ribbed, laterally compressed, not abaxially keeled, abaxial wings absent, lateral wings absent, glands absent. x = 7.

Distribution

North America, Europe, Australia

Discussion

Species 5 (1 in the flora).

... more about "Damasonium"
Acuminate (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
Miller +
rounded;attenuate +
narrow-lanceolate +  and ovate +
lanceolate +  and ovatelanceolate +
North America +, Europe +  and Australia +
u--shaped +
Greek, ancient name +
hypogynous +
keeled +  and compressed +
decumbent +  and floating +
petiolate +  and sessile +
1 +  and 2 +
decumbent +  and floating +
ascending +  and spreading +
Pink (?) +  and White (?) +
deciduous +
triangular +
The Gardeners Dictionary (fourth edition) +
decumbent +  and floating +
vuille1987a +
not septate +
persistent +
Machaerocarpus +
Damasonium +
Alismataceae +
bracteolate +  and branching +