Difference between revisions of "Waldsteinia"
Ges. Naturf. Freunde Berlin Neue Schriften 2: 105, plate 4, fig. 1. 1799.
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|distribution=North America;Eurasia;temperate regions. | |distribution=North America;Eurasia;temperate regions. | ||
|discussion=<p>Species 6 or 7 (4 in the flora).</p><!-- | |discussion=<p>Species 6 or 7 (4 in the flora).</p><!-- | ||
| − | --><p>Plants of Waldsteinia are distinctive, small, rhizomatous, and often mat-forming herbs of woodlands with ternate or three- to five-lobed leaves, differing from Geum by their long, straight, deciduous styles. J. E. E. Smedmark (2006) showed that the type species of Waldsteinia is nested in Geum.</p> | + | --><p>Plants of <i>Waldsteinia</i> are distinctive, small, rhizomatous, and often mat-forming herbs of woodlands with ternate or three- to five-lobed leaves, differing from <i>Geum</i> by their long, straight, deciduous styles. J. E. E. Smedmark (2006) showed that the type species of <i>Waldsteinia</i> is nested in <i>Geum</i>.</p> |
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|publication year=1799 | |publication year=1799 | ||
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|subfamily=Rosaceae subfam. Rosoideae | |subfamily=Rosaceae subfam. Rosoideae | ||
|tribe=Rosaceae tribe Colurieae | |tribe=Rosaceae tribe Colurieae | ||
Latest revision as of 22:53, 5 November 2020
Herbs, perennial, scapose, often mat-forming, 1–4 dm, strigose; rhizomatous. Stems 1–20+, ± erect. Leaves deciduous, basal, sometimes clustered around scape, simple or compound; stipules adnate to petiole base, narrow, scarious, margins entire; petiole present; blade ± rounded, deeply cordate, ternate or 3–5(–7)-lobed, 3–5 cm, herbaceous, margins flat, when lobes usually shallow, dentate, often with large teeth distally, venation palmate, surfaces strigose or hirsute. Inflorescences terminal, 3–8-flowered, panicles, open, ± as long as petioles, elongating somewhat in fruit; bracts present; bracteoles absent. Pedicels present. Flowers 8–20 mm diam.; epicalyx bractlets 0 [5, minute]; hypanthium broadly obconic to obcampanulate, slightly contracted at mouth, 2–4 mm, strigose or glabrous; sepals 5, spreading, triangular; petals 5, yellow, obovate to elliptic, elliptic-lanceolate, or suborbiculate; stamens 50–70, ± equal to petals, filaments persistent; torus not evident, receptacle base villous; carpels 3–7, short-villous; ovule 1. Fruits aggregated achenes, 3–7, broadly crescent-shaped, 1.5–2.5 mm, short-villous; hypanthium persistent; sepals persistent, ± reflexed; styles deciduous, not hooked. x = 7.
Distribution
North America, Eurasia, temperate regions.
Discussion
Species 6 or 7 (4 in the flora).
Plants of Waldsteinia are distinctive, small, rhizomatous, and often mat-forming herbs of woodlands with ternate or three- to five-lobed leaves, differing from Geum by their long, straight, deciduous styles. J. E. E. Smedmark (2006) showed that the type species of Waldsteinia is nested in Geum.
Selected References
Lower Taxa
Key
| 1 | Leaves mostly ternately compound, rarely merely deeply lobed | > 2 |
| 1 | Leaves 3–5(–7)-lobed, shallowly so or to ± 2/3 cleft | > 3 |
| 2 | Petals obovate to broadly elliptic, 3.5–10 mm, much longer than sepals. | Waldsteinia fragarioides |
| 2 | Petals elliptic to elliptic-lanceolate, 2.5–4.5 mm, shorter than to barely exceeding sepals. | Waldsteinia parviflora |
| 3 | Flowers 8–10 mm diam.; petals narrowly elliptic, barely exceeding sepals, bright yellow. | Waldsteinia lobata |
| 3 | Flowers 15–18 mm diam.; petals broadly elliptic to suborbiculate, much longer than sepals, creamy yellow. | Waldsteinia idahoensis |