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FNA | Family List | FNA Vol. 14 | Convolvulaceae | Cuscuta

25. Cuscuta indecora Choisy, Mém. Soc. Phys. Genève. 9: 278, plate 3, fig. 3. 1842.
[F W]

Large-seed dodder

Stems yellow to orange, slender to medium. Inflorescences loose to dense, paniculiform or cor­ymbiform, sometimes origi­nat­ing endogenously; bracts at base of clusters 1, at base of pedi­cels 0 or 1, ovate to lanceolate, mem­branous, margins entire, apex acute. Pedicels 0.5–6 mm, usu­ally papillate. Flowers 5-merous, 3–4.5(–5.3) mm, fleshy, perianth cells convex, domelike, perianth and ovary usually papillate; calyx creamy yellow to brownish, cupulate, 1/23/4 or longer than corolla tube length, divided 1/32/3 its length, not reticulate or shiny, lobes triangular-ovate to lanceolate, bases overlapping or not, margins entire, midvein not carinate, apex acute to attenuate; corolla white, drying creamy yellow to dark brown, 2.5–4(–5) mm, tube campanulate to campanulate-cylindric, becoming sub­globose or urceo­late, 1.7–3 mm, not saccate, lobes sub­erect to erect, triangular-ovate, 1/3 to equaling corolla tube length, margins entire, apex acute, inflexed; infrastaminal scales sub­spatulate to spatulate, 1.7–3 mm, equaling corolla tube length, bridged at 0.3–0.9 mm, usually rounded, rarely truncate or 2 or 3(or 4)-lobed, uniformly densely fimbriate, fimbriae 0.4–0.7 mm; stamens barely exserted or included, shorter than corolla lobes; filaments 0.3–0.7 mm; anthers 0.3–0.8 × 0.2–0.5 mm; styles filiform, 1–2.5 mm, equaling ovary. Capsules globose to subglobose, 2–3.5 × 1.9–4(–5) mm, thickened and raised around relatively mid-sized interstylar aperture, translucent, surrounded or capped by withered corolla, indehiscent. Seeds 2–4, shape heterogeneous on same plant: obcompressed to weakly angled, broadly ellipsoid to transversely oblique, 1.4–1.8 × 1.2–1.6 mm, hilum region usually subterminal, rarely almost terminal.

Varieties 3 (3 in the flora): North America, Mexico, West Indies, South America.

Cuscuta indecora is closely related to C. coryli; it differs by its usually five-merous, larger flowers, uni­formly densely fimbriate infrastaminal scales, and more or less translucent, globose to subglobose capsules.


1 Calyces shorter than corolla tubes, divided 1/31/2 lengths, lobes triangular-ovate, bases overlapping   25a Cuscuta indecora var. indecora
+ Calyces longer than corolla tubes, divided 2/3 lengths, lobes lanceolate, bases not overlapping.   (2)
       
2 (1) Flower clusters loose; calyx lobe apices acute; hosts: herbs and woody plants, including Iva annua   25b Cuscuta indecora var. longisepala
+ Flower clusters dense; calyx lobe apices acute-attenuate; hosts: usually Iva annua, rarely Symphyotrichum 25c. Cuscuta indecora var. attenuata   (1)

Lower Taxa


 

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