770 MALVACEAE 



form or fan-shaped, or some of them suborbicular, 7-16 mm. long, repand-dentate or cre- 

 nate, closely pubescent ; stipules linear : flowers nearly sessile : calyx carnpanulate ; lobes 

 lanceolate, 4-6 mm. long, somewhat acuminate : petals yellow, 5-7 mm. long : fruit oval, 

 surpassing the calyx : carpels about 5, thin-walled, acuminate, 2-beaked on dehiscing. 



In saline or partly saline soil along the Rio Grande, Texas and adjacent Mexico. Spring to fall. 



2. Sida H611eri Rose. Perennial, thinly cinereous-tomentose. Stems much branched 

 at the base, the branches erect or spreading, 1-3 dm. long : leaf-blades suborbicular, 1-2 

 cm. in diameter, crenate, rounded or subcordate at the base ; petioles about as long as the 

 blades : peduncles very short or the flowers sometimes nearly sessile : calyx campanulate ; 

 lobes ovate, 6-9 mm. long, obtuse, or acutish : petals pale copper-colored, surpassing the 

 calyx, slightly oblique, expanding at about 4 o'clock in the afternoon: fruit globular or 

 spheroidal : carpels obtuse. 



In sand, near Corpus Christi, Texas. Spring and summer. 



3. Sida hastata St. Hil. Perennial, hirsute or strigillose with stellate hairs. Stems 

 branched at the base, the branches decumbent or prostrate, 2-7 dm. long : leaf-blades 

 rather succulent, ovate, oblong or oval, 2-7 cm. long, crenate or serrate-crenate, obtuse at 

 the apex, truncate or cordate at the base ; petioles as long as the blades or shorter, finally 

 recurving : calyx more or less hirsute, accrescent ; lobes much longer than the tube, ovate 

 to suborbicular, mucronate, 6 mm. long, becoming 12 mm. at maturity, cordate, converg- 

 ing, forming a 5-winged bladder in fruit : petals buff, hardly surpassing the calyx : carpels 

 10, 2.5-3.5 mm. long, membranous, grooved on the back, reticulated. [S. physocalyx A. 

 Gray. ] 



In valleys, Texas to Arizona and Mexico. Also in northern South America. Spring to fall. 



4. Sida ciliaris L. Perennial, strigose or hirsute-strigose. Stems diffusely branched 

 :at the base, the branches prostrate, 1-3 dm. long, more or less branched : leaf-blades oblong 

 to cuneate, 1-4 cm. long, obtuse or retuse at the apex, serrate, especially above the middle, 

 obtuse or subcordate at the base : petiole? 3-8 mm. long : flowers clustered at the ends of 

 the branches : pedicels slender, shorter than the subtending petioles and ciliate linear or 

 spatulate stipules : calyx hirsute ; lobes triangular, about as long as the tube : petals red- 

 dish purple, 6-12 mm. long : carpels 5-8, sharply reticulate-wrinkled or tuberculate on the 

 back, 2-beaked at the apex. 



In gand, Florida Keys and Texas. Also in tropical America. Spring to winter. 



5. Sida hermaphrodita (L. ) Rusby. Perennial, glabrous, or the young foliage 

 pubescent. Stems erect, 1-4 m. tall, branched : leaf-blades 5-30 cm. in diameter, pal- 

 mately 3-7-lobed, cordate, the lobes triangular, acuminate, irregularly serrate, the middle 

 one longest ; petioles shorter than the blades, at least above : peduncles corymbosely dis- 

 posed : calyx softly puberulent ; lobes triangular, acute, shorter than the campanulate 

 tube : petals white, obovate, rounded at the apex, 12-15 mm. long : carpels 6-7 mm. long, 

 nearly glabrous, with acuminate beaks. [S. Napaea Cav.] 



On river banks, Pennsylvania to Virginia and Tennessee. Summer and fall. 



6. Sida filifoi mis Moric. Perennial, minutely canescent-puberulent. Stems several 

 or many from the top of the root, simple or branched, 1-4 dm. long : leaf-blades ovate, 

 lanceolate or oblong, 1-2 cm. long, crenate-dentate, truncate or subcordate at the base ; 

 petioles as long as the blades or somewhat shorter ; stipules subulate : pedicels 1-2 cm. long, 

 much longer than the petioles : calyx becoming 5 mm. long ; tube ribbed ; lobes triangular 

 or deltoid, acute, about as long as the tube : corolla yellow or yellowish white, 1-1.5 cm. 

 broad : carpels about 3 mm. high, each with 2 short-subulate teeth. 



In sandy soil, Texas to Arizona and Mexico. Spring and summer. 



7. Sida diffusa H.B.K. Similar to S. filiformis in habit, but commonly somewhat 

 stouter. Leaf-blades smaller and commonly narrower : calyx becoming 6-8 mm. long ; 

 lobes lanceolate or triangular-lanceolate, acuminate, much longer than the tube : carpels 

 about 3 mm. high, each with 2 short awns. 



In dry soil, southern Texas to New Mexico and Mexico. Spring and summer. 



8. Sida supina L'Her. Annual or perennial, finely tomentose. Stems branched at 

 the base, the branches ascending or prostrate, 1-6 dm. long, more or less branched : leaf- 

 blades suborbicular to ovate, 1.2.5 cm. long, obtuse, crenate, usually cordate at the base ; 

 petioles somewhat shorter than the blades : flowers axillary, not conspicuous : pedicels 

 very slender, shorter than the petioles : calyx slightly accrescent ; lobes acuminate, shorter 

 than the tube : petals yellow, 4-6 mm. long, slightly exceeding the calyx : carpels often 

 5, 2 mm. long, reticulate-wrinkled, puberulent, slightly 2-beaked at the apex. 



In sand, Florida Keys. Also in the West Indies and South America. Throughout the year. 



9. Sida cordifblia L. Annual (within our range), velvety tomentose. Stems erect, 

 6-15 dm. tall, much-branched : leaf-blades ovate or suborbicular, 4-10 cm. long, obtuse or 



