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1 Styles united for most of their length; capsule circumscissile; [subgenus {or genus} Monogynella]. |
..2 Stigmas flattened-depressed; flowers 2.5-4 mm long |
..2 Stigmas oval or conical; flowers ca. 2 mm long |
1 Styles separate and distinct from the base; capsule not circumscissile (except the rare aliens C. epilinum and C. epithymum). |
....3 Stigmas elongated, terete or conical; capsule circumscissile; [subgenus {or genus} Cuscuta]. |
......4 Style about equaling the ovary, included in the corolla; fruit 2.0-2.5 mm long |
......4 Style (including the stigma) much longer than the ovary, exserted from the corolla; fruit ca. 1.5 mm long |
....3 Stigmas capitate, about as wide as long; capsule not circumscissile, either indehiscent or rupturing irregularly; [subgenus {or genus} Grammica]. |
........5 Each flower subtended by 1-10 imbricate bracts; sepals distinct nearly to the base. |
..........6 Bracts lanceolate, the apices reflexed or spreading (squarrose) |
..........6 Bracts ovate or orbicular, the apices erect, appressed and imbricate. |
............ 7 Pedicels absent, the flowers in compact clusters sessile on the stem; bracts tightly subtending the flower, orbicular with rounded apices; styles not exserted in flower, and only 1.5-1.8 mm long in fruit; corolla lobes 0.9-1.1 mm long |
............ 7 Pedicels 0.5-3 mm long, the flowers in loose panicles; bracts loosely subtending the flower, ovate with bluntly pointed apices; styles long-exserted, 2.5-3.5 mm long in flower and fruit; corolla lobes 1.8-2.0 mm long |
........5 Flowers not bracteate (rarely a single bract may be present towards the base of the pedicel); sepals various. |
............ ..8 Perianth surface granular (papillate); fresh flowers fleshy; corolla lobes acute, tips typically curved inward. |
............ ....9 Corolla tubular; calyx > ½ as long as the corolla; flowers 4 (-5)-merous; infrastaminal scales reduced, merely bifid or shallowly toothed |
............ ....9 Corolla campanulate; calyx ca. ½ as long as the corolla; flowers 5-merous; infrastaminal scales profusely fringed |
............ ..8 Perianth surface not granular; fresh flowers not especially fleshy; corolla lobes various. |
............ ......10 Stylopodium (a thickened ridge at the base of the style) present; flowers 5-merous. |
............ ........11 Ovary blunt to pointed, but not beaked; corolla 2.2-3.5 mm long, 2-3 mm wide; seeds ca. 1.5 mm long; [widespread] |
............ ........11 Ovary with a long, beak-like projection at the top; corolla 4-6 mm long, 4-6 mm wide; seeds 2-3 mm long; [of the Mountains] |
............ ......10 Stylopodium absent; flowers 3-4-merous or 5-merous. |
............ ..........12 Flowers subsessile, therefore in globular inflorescences. |
............ ............ 13 Flowers 5-merous |
............ ............ 13 Flowers mostly 3-4-merous. |
............ ............ ..14 Corolla lobes rounded or obtuse |
............ ............ ..14 Corolla lobes acute |
............ ..........12 Flowers on pedicels slightly shorter than to longer than the flowers, therefore in loose inflorescences. |
............ ............ ....15 Flowers mostly longer than wide |
............ ............ ....15 Flowers mostly as wide as long. |
............ ............ ......16 Flowers 1.5-3.0 mm long, at least some exceeding 2.5 mm long; calyx lobes not overlapping at the base in older flowers, and therefore the flowers not pronouncedly 5-angled |
............ ............ ......16 Flowers 0.9-2.5 mm long; calyx lobes strongly overlapping and forming definite angles at the sinuses, thus the flower strongly 4-5-angled. |
............ ............ ........17 Flowers 4-merous; flowers 0.9-1.4 mm long; stems very slender; [on granite and sandstone outcrops] |
............ ............ ........17 Flowers 5-merous; flowers 1.5-2.5 mm long; stems not especially slender; [widespread] |