Cuscuta umbellata |
Cuscuta azteca |
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flat-globe dodder |
globe dodder |
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Stems | orange-yellow, slender. |
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Inflorescences | dense, corymbiform to glomerulate; bracts at base of clusters 1, at base of pedicels 0 or 1, ovate, membranous, margins entire, apex acute. |
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Pedicels | 0.4–1.3 mm. |
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Flowers | 5-merous, 2–2.6 mm, membranous, not papillate; calyx straw yellow, cupulate, equaling corolla tube length, divided 2/3 its length, finely reticulate, shiny, lobes ovate, bases not overlapping, margins entire, midvein with multicellular protuberances, apex acute; corolla white, drying creamy, 1.5–2.1 mm, tube cylindro-campanulate, becoming globose, 0.8–1.2 mm, not saccate, lobes erect to spreading, ovate-triangular, shorter than to equaling corolla tube length, margins usually entire, sometimes irregularly toothed, apex acute, straight to slightly incurved; infrastaminal scales oblong or rounded, 0.9–1.3 mm, equaling or slightly longer than corolla tube length, bridged at 0.1–0.2 mm, uniformly fimbriate in distal 1/2, fimbriae 0.1–0.3 mm; stamens exserted, shorter than corolla lobes; filaments 0.3–0.6 mm; anthers 0.2–0.3 × 0.2–0.3 mm; styles filiform, 0.4–0.7 mm, shorter than to equaling ovary. |
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Capsules | depressed-globose, 1.5–2.5 × 1–1.8 mm, not thickened or raised around relatively small interstylar aperture, translucent, loosely surrounded or capped by withered corolla, dehiscence circumscissile. |
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Seeds | 3 or 4, angled, broadly ellipsoid to subglobose, 0.8–1 × 0.7–0.9 mm, hilum region almost terminal. |
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Cuscuta umbellata |
Cuscuta azteca |
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Phenology | Flowering Jul–Nov. | |
Habitat | Hosts: Asteraceae, Euphorbiaceae, Fabaceae (especially Dalea), Malvaceae. | |
Elevation | 600–1800 m. (2000–5900 ft.) | |
Distribution |
United States; Mexico; South America; West Indies
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AZ; NM; Mexico |
Discussion | Varieties 2 (1 in the flora). Variety desertorum Engelmann is known from South America (Brazil). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 14. | FNA vol. 14. |
Parent taxa | Convolvulaceae > Cuscuta > subg. Grammica | Convolvulaceae > Cuscuta > subg. Grammica |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | C. potosina var. globifera | |
Name authority | Kunth in A. von Humboldt et al.: Nov. Gen. Sp. 3(fol.): 95; 3(qto.): 121. (1819) | Costea & Stefanović: Organisms Diversity Evol. 11: 381, figs. 1h, 2g, 4. (2011) |
Web links |