Sida urens

Linnaeus

Syst. Nat. ed. 10: 1145. 1759.

Common names: Bristly sida tropical fanpetals
Introduced
Synonyms: Sida verticillata Cavanilles
Treatment appears in FNA Volume 6. Treatment on page 319. Mentioned on page 311.

Herbs or subshrubs, perennial, often scandent, 0.5–1.5 m. Stems erect or reclining, with simple 1.5–3 mm hairs mixed with shorter stellate hairs, rarely only stellate-hairy. Leaves: stipules free from petiole, 1-veined, subulate, 2–5 mm; petiole 10–30 mm, 1/4–1/2 (to nearly equaling) blade length, pubescence like stem; blade ovate to triangular, 4–9 cm, 1.5–2 times longer than wide, base cordate, margins crenate-serrate or coarsely serrate to base, apex acuminate or attenuate, surfaces sparsely pubescent, abaxial surface stellate-pubescent, adaxial surface stellate-pubescent or with simple, often antrorsely-oriented hairs. Inflorescences axillary, dense, subsessile, 3–8- glabrous or nearly so; mericarps 5, 3 × 1.5 mm, laterally faintly striate to smooth, apex muticous. 2n = 32.


Phenology: Flowering year-round.
Habitat: Disturbed sites
Elevation: 0–10 m

Distribution

V6 586-distribution-map.jpg

Introduced; Fla., Mexico, West Indies, Central America, South America, also in Africa, Indian Ocean Islands (Madagascar), Pacific Islands (Hawaii)

Discussion

Sida urens was found only recently (2008) in Broward County. The species is easily distinguished by its long-acuminate beaked flower buds, setose calyx, cordate-acuminate leaves, and tendency to have long, reclining stems. It is rather common in tropical regions.

Selected References

None.

Lower Taxa

None.
... more about "Sida urens"
stellate-pubescent +
with simple , often antrorsely-oriented hairs;stellate-pubescent +
muticous;attenuate;acuminate +
Paul A. Fryxell† +  and Steven R. Hill +
Linnaeus +
cordate +
asymmetric +  and symmetric +
ovate +  and triangular +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
indehiscent +  and loculicidal +
Bristly sida +  and tropical fanpetals +
reddish +, red-orange +, salmon-pink +, yellow-orange +, yellow +, cream +  and white +
Fla. +, Mexico +, West Indies +, Central America +, South America +, also in Africa +, Indian Ocean Islands (Madagascar) +  and Pacific Islands (Hawaii) +
well-differentiated +
0–10 m +
sparse;copious +
pistillate +  and staminate +
unisexual +  and bisexual +
hairy +  and glabrous +
muticous +
Disturbed sites +
antrorsely-oriented +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
nearly +  and 3-8-glabrous +
tough-fibrous +
connate +  and distinct +
dehiscent +  and indehiscent +
subsessile +  and petiolate +
acuminate +  and triangular or ovate +
serrate +  and crenate-serrate +
3 cm30 mm <br />0.03 m <br /> (?) +
laterally faintly striate +  and smooth +
wedge--shaped +
1.5 cm15 mm <br />0.015 m <br /> (?) +
3-40-carpellate +
(1-)2-many +
adnate +  and distinct +
1/4 +  and 1/2 +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering year-round. +
Syst. Nat. ed. +
reniform +
persistent +
Introduced +
sessile +  and subsessile +
reclining;erect +
stellate-hairy +
filiform +, linear +  and capitate +
1-2 times number of carpels +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
5-14-branched +
Sida verticillata +
Sida urens +
species +
subshrub +, scandent +  and herb +
monoecious +, dioecious +  and hermaphroditic +