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Sida Linn., Sp. Pl. 683. 1753. Gen.Pl.ed.5.306 1754; Boiss., Fl. Or.1:835. 1867; Mast, in Hook.f.,Fl.Brit.Ind.l:322.1875; Hu, Fl. China, fam. 153. 13. 1955; Borss. in Blumea, 14 (1): 177. 1966; Hutch., Gen. Fl. Pl. 2:560. 1967.
Annual to perennial herbs, undershrubs or shrubs, mostly pubescent. Leaves subsessile to long petiolate, stipulate, alternate, entire to toothed or lobed. Flowers axillary, solitary, fasciculate or by reduction of terminal leaves raceme or panicle, sessile or pedicellate. Epicalyx generally absent. Calyx campanulate. Corolla yellow, white, pink or orange. Staminal column usually included, hairy or glabrous, divided above into numerous antheriferous filaments. Carpels 5-10 (-14); ovary as many loculed as the number of carpel, each locule 1-ovuled; style branches the same number as of carpels; stigma capitate. Fruit usually globular pubescent or glabrous, awned or muticous; mericarps smooth or retriculate, dehiscent or indehiscent. Seed 1 per mericarp, glabrous or hairy; cotyledons curved.
Distribution: About 150 species in the tropics and subtropics of both hemispheres. Of these c. 2/3rd are restricted to America.
In Pakistan it is represented by 12 specific and infraspecific taxa.
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| 1 |
Mericarps generally 5 |
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(2) |
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Mericarps generally 7-10 |
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(6) |
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| 2 (1) |
Branches, petiole and pedicel with stellate and simple, spreading hairs, leaves palminerved. Mericarps smooth, mucronate |
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(3) |
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Branches, petiole and pedicel with stellate hairs only. Leaves penninerved. Mericarps reticulate, awned |
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(4) |
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| 3 (2) |
Plant prostrate or subprostrate, eglandular hairy |
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Sida cordata |
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Plant erect, glandular hairy |
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Sida mysorensis |
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| 4 (2) |
1-3 spiny structures present on the stem at the base of petiole. Mericarps with a pair of divergent apical awns |
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Sida spinosa |
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Spiny structure absent. Mericarps with a pair of convergent apical awns |
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(5) |
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| 5 (4) |
Flowers usually solitary. Pedicel in fruit 1-2 cm long |
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Sida alba |
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Flowers fasciculate. Pedicel in fruit usually less than 1 cm long |
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Sida yunnanensis |
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| 6 (1) |
Mericarps usually 9-10, dehiscent; awns 3-5 mm long, retrorsely hairy |
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Sida cordifolia |
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Mericarps usually 7-8, indehiscent; awns c.1 mm long, not retrorsely hairy |
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(7) |
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| 7 (6) |
Calyx 6-10 mm long, 5-7 mm broad, tube prominently angular. Fruit completely enclosed by calyx. (flowers yellow) |
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Sida pakistanica |
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Calyx 4-6 mm long, 3-4 mm broad, tube not or subangular. Fruit never completely enclosed by calyx |
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(8) |
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| 8 (7) |
Flowers solitary, pale yellow. Fruiting pedicel 1.5-3 cm long, with a joint at the apex |
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Sida alii |
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Flowers usually paired, white. Fruiting pedicel usually 0.5-1 cm long, without or with a joint in the middle |
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Sida ovata |
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List of lower taxa
| Related Links (opens in a new window) |
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Treatments in Other Floras @ www.efloras.org
Other Databases
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