MALVACEAE 773 



1. Urena lobata L. Shrubby, tomentose. Leaf-blades orbicular-reniform, subor- 

 bicular or oval on the upper part of the stem, shallowly 3-5-lobed, serrulate, cordate or 

 rounded at the base, whitish and prominently nerved beneath ; petioles shorter than the 

 blades : peduncles axillary, several mm. long : bractlets of the involucel 5-7, linear-lance- 

 olate, 3-5 mm. long : calyx about as long as the bractlets or shorter ; lobes often ovate, 

 acute : petals pink or rose-colored, about 2 cm. long, very delicate : carpels subglobose, 

 4-5 mm. in diameter, bristly. 



In waste places, Florida. Naturalized from the West Indies, but originally from India. Through- 

 out the year. 



11. FAVONIA Cav. 



Shrubs or shrubby herbs, with pubescent foliage. Stems usually upright. Leaves 

 alternate, stipulate : blades angled or lobed. Flowers perfect, commonly solitary on axil- 

 lary pedicels. Involucels of 5-15 bractlets. Sepals 5, partially united. Petals 5, of 

 various colors. Carpels 5, 1-celled. Styles 10. Stigmas capitate. Ovules solitary. Ma- 

 ture carpels separating from the axis, 1-3-beaked on the back, or unarmed, rarely 2-winged, 

 indehiscent or more or less deeply 2-valved. Seeds solitary, ascending. The plants flower 

 from spring to fall or throughout the year. 



Carpels awnless and pointless. 



Leaf-blades hastate : petals blotched at the base. 1. P. haslata. 



Leaf-blades ovate to orbicular-ovate : petals not blotched. 2. P. lasiopetala. 

 Carpels 3-awned or 2-3-horned. 



Leaf-blades toothed : bractlets 5 : carpels with 2 lateral awns. 3. P. spinifex. 



Leaf-blades nearly entire : bractlets 9-11 : carpels with 2 lateral cusps. 4. P. racemosa. 



1. Pavonia hastata Cav. A much branched, shrubby plant, 1-2 m. tall, the foliage 

 rough ish-canescent. Leaf-blades hastate or ovate-hastate, acutish, crenate-dentate, 2-5 cm. 

 long, cordate ; petioles much shorter than the blades : peduncles much longer than the pet- 

 ioles : bractlets of the involucels 5-6, ovate to obovate, 4-5 mm. long, slightly united at the 

 base : calyx about as long as the bractlets ; lobes broadly ovate, short-acuminate : petals 

 obovate, 1.5-2.5 cm. long, pale red with a dark blotch at the base, delicately striped : car- 

 pels obovate, 4.5-5 mm. long, prominently reticulated, without either awns or tips. 



In sandy soil, Georgia. Naturalized from South America. Spring to fall. 



2. Pavonia lasiopetala Scheele. A branching shrubby plant 4-12 dm. tall, the foliage 

 velvety tomentose. Leaf -blades ovate to suborbicular, 2-8 cm. long, obtuse or acutish, dentate 

 or crenate-dentate, paler beneath than above, cordate ; petioles as long as the blades or 

 nearly so : peduncles as long as the petioles or longer : bractlets of the involucels linear, 

 1-1.5 cm. long: calyx shorter than the bractlets ; lobes ovate, acuminate, 3-5-nerved : 

 petals pink, 1.5-2 cm. long, glabrous or pubescent, often undulate : carpels 5-6 mm. long, 

 pointless, more or less strongly reticulated. [P. Wrightii A. Gray. ] 



In dry and rocky woods, Texas and adjacent Mexico. 



3. Pavonia spinifex (L. ) Cav. A branching shrub, 1-3 m. tall, with hirsute and 

 strigillose foliage. Leaf-blades membranous, ovate or oblong-ovate, 5-10 cm. long, acute or 

 somewhat acuminate, more or less distinctly doubly crenate-dentate, truncate or subcordate 

 at the base ; petioles densely pubescent, shorter than the blades : peduncles axillary, much 

 longer than the petioles : bractlets of the involucel 5, linear to lanceolate, acute, nearly 1 

 cm. long : calyx about as long as the bractlets ; lobes lanceolate to ovate-lanceolate : pet- 

 als yellow, 2.5 cm. long, rather cuneate : carpels 5-6 mm. high, with 1 medial and 2 lat- 

 eral retrorsely barbed awns. 



In sandy soil, near the coast, South Carolina to Florida. Naturalized from tropical America. 



4. Pavonia racemosa L. A sparingly-branched, shrubby plant ranging from 1-3 

 m. in height, the foliage more or less densely puberulent. Leaf-blades ovate to oblong-ovate, 

 6-15 cm. long, acuminate, remotely serrate or repand, rounded or subcordate at the base, 

 prominently 3-nerved beneath ; petioles shorter than the blades : racemes terminal, loosely 

 flowered : bractlets of the involucels 6-8, oblong-lanceolate, 9-11 mm. long : calyx equal- 

 ling the bractlets or longer ; lobes ovate, acute, thickish : petals twice as long as the calyx, 

 greenish yellow or whitish, finely pubescent without : carpels about 1 cm. long, reticu- 

 lated on the back, with a medial crest and 2 lateral cusps. 



In or near swamps, Florida and tropical America. 



12. MALVAVISCUS Dill. 



Shrubs, trees, or shrubby herbs, commonly with hispid foliage. Leaves alternate : 

 blades entire, toothed or rarely angulately lobed, petioled. Involucels of 7-12 narrow 

 bractlets. Flowers perfect, on axillary peduncles. Sepals 5, partially united. Petals 5, 



