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Key to CuscutaView taxon page for Cuscuta
(For a list of species in Cuscuta, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Styles 2, fused (Subg. Monogynella) 3. Stigmas elongate; calyx abruptly narrowed to short, obtuse  Having a short-tapered, blunt tip or base, the sides convex or straight and converging at more than a right angle. , fleshy appendage (Subg. Cuscuta) ..... C. approximata 3' Stigmas spheric to widely elliptic  In the shape of a flattened circle or ellipse; wider than linear ; calyx lobes  1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. not narrowed to appendage (Subg. Grammica) 5' Corolla lobes 3/4 to > tube, narrowly lanceolate  Narrowly elongate, widest in the basal half, often tapered to an acute tip. to lanceolate, tips not incurved 6. Styles 0.5–1(1.5) mm; anthers 0.25–0.5 mm, wide-elliptic; fruit translucent, surrounded by corolla ..... C. occidentalis 6' Styles 1.2–3 mm; anthers 0.7–1.1 mm, oblong  Longer than wide, with nearly parallel sides; wider than linear. to linear  Elongate, with nearly parallel sides; narrower than elliptic or oblong. ; fruit not translucent, ± enclosed by corolla (top not or barely visible) 8' Ovary, fruit spheric to spheric-depressed; seeds (1)2–4 9. Perianth, pedicels  Stalk of an individual flower in an inflorescence, or the corresponding structure in fruit. dense-papillate ..... var. papillosa 9' Perianth, pedicels not papillate  Pertaining to a surface (e.g., of a leaf, stigma, fruit) bearing small, rounded or conic protuberances (papillae). ..... var. californica 4' Corolla scales present 10. Corolla scales generally reduced, shallowly finely dentate  Having margins with sharp, relatively coarse teeth pointing outward, not tipward. (rarely 2-lobed, ± fringed  Having ragged or finely cut margins. into 1–3 short units on each side of filaments) ..... C. suksdorfii 10' Corolla scales well developed, fringed 11. Calyx, corolla lobe 1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. tips dissimilar, calyx lobe tips obtuse to rounded, corolla lobe tips acute  Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle. 11' Calyx, corolla lobes tips similar, both either acute to long-acuminate or obtuse to rounded 13. Calyx, corolla lobes obtuse to rounded 14. Calyx veined, shiny; calyx, corolla lobes finely dentate; seeds 1, spheric to spheric-ovoid ..... C. denticulata 14' Calyx not veined, not shiny; calyx, corolla lobes entire  Having margins that are continuous and smooth (i.e., without teeth, lobes, etc.). or calyx lobes finely serrate  Having margins with sharp, fine to coarse teeth generally pointing tipward, not outward; margins with such teeth on such primary teeth are doubly serrate. ; seeds (1)2–4 13' Calyx, corolla lobes acute to long-acuminate 16' Corolla lobe tips straight or recurved  Gradually curved downward or backward. but not incurved 17. Embryo enlarged on 1 end 18. Flowers 1–2(5), (2.8)3–4(5) mm; calyx lobes lanceolate, ± entire; anthers 0.4–0.7 mm, filaments (0)0.1–0.3 mm; desert, on shrubs in Atriplex, Ambrosia, Psorothamnus, Xylorhiza ..... C. nevadensis 18' Flowers (1)2–5, 1.9–3.2 mm; calyx lobes oblong to obovate-rhombic, ± irregularly finely dentate; anthers 0.3–0.4 mm, filaments 0.2–0.4 mm; desert, on Bursera, Schinus. (Extirpated) ..... C. veatchii 17' Embryo not enlarged on 1 end 19. Flower 5–7(9) mm; calyx generally 1/2 corolla tube, lobe bases overlapped; corolla lobes 1/4–1/3 tube; anthers 0.8–2 mm ..... C. subinclusa 19' Flower 2.5–5(6) mm; calyx generally ± = corolla tube, lobe bases generally not overlapped; corolla lobes generally ± = tube; anthers 0.3–0.7 mm 20. Flowers in host inflorescence, parts in 4s(5s); calyx, corolla lobes acuminate  Having a long-tapered, sharp tip, the sides concave. to long-acuminate; fruit spheric to spheric-depressed, not thickened, not raised around opening between styles; seeds 1–4 ..... C. howelliana 20' Flowers not in host inflorescence, parts in 5s; calyx, corolla lobes acute to acuminate; fruit elliptic-ovoid, ± thickened, ± raised around opening between styles; seeds 1–2 21. Pedicels (0.5)1–5 mm; flower 2.5–4.5 mm; corolla tube ± cylindric  Elongate, with parallel sides and, at any point, round in transverse section. , lobes reflexed  Abruptly bent or curved downward or backward. to spreading  Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal. , ovate- to lance-oblong; inland salt flats ..... C. salina 21' Pedicels 0.5–2 mm; flower 3.5–6 mm; corolla tube bell-shaped, lobes spreading to erect  Upright; vertically oriented. , widely ovate  Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. ; coastal salt marshes, interdune depressions, tidal flats ..... C. pacifica
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