182 American Midland Naturalist Monograph No. 2 



3. Flowers yellow; leaves linear; stigmas capitate; carpels I -seeded.. .3. Malvasinim 

 2. Bracts 6-9. 



6. Stigmas linear; carpels I -seeded 2. Althaea 



6. Stigmas capitate; carpels united into a 5-valved capsule 9. Hibiscus 



1. Calyx without bracts. 



7. Petals yellow; flowers perfect; leaves not lobed. 



8. Leaves less than 3 cm. broad, ovate-lanceolate, serrate, and \vith a small tubercle 



at the base; petals less than 1 cm. long; carpels 5, each 1 -seeded 7. Sida 



8. Leaves 6-30 cm. broad, cordate, acuminate, velvety-pubescent, long-petioled; 



petals 10-15 mm. long; carpels 12-15, each several-seeded 8. Abuiilon' 



7. Petals white; plants dioecious; leaves orbicular, palmately 7- 1 I -lobed; carpels 

 8-10, rugose-reticulate, each 1 -seeded 4. Napaea 



I. Malva L.— Mallow 



L Petals not more than twice as long as the sepals. 



2. Leaves crisped on the margins; carpels reticulate; stem stout, erect, 0.5-2 

 m. tall; escaped from cult.; native of Eur. July-Sept M. crispa L. 



2. Leaves not crisped. 



3. Stems erect; petals 5 mm. long; carpels 8-11, more or less pubescent 

 and rugose on the back; weed in waste places, native of Eur. July- 

 Aug. [M. pHsilla With.} Round-leaved Mallow ..M. rotundifolia L. 



3. Stems prostrate or ascending; petals 10-12 mm. long; carpels 12-15, 

 pubescent; waste places, adventive from Eur. May-Sept. [M. rotun- 

 difolia of auth., not L.} M. neglecta Wallr. 



1. Petals 3-8 times as long as the sepals. 



4. Leaves 3-7-lobed; petals purple; carpels wrinkled; occasional in waste 

 places as a garden escape. Aug. -Sept M. sylvestris L. 



4. Leaves deeply dissected; petals pink; carpels pubescent; roadsides, escaped 

 from cult.; native of Eur. June. Musk Mallow M. moschata L. 



2. Althaea L. Hollyhock 

 A. rosea Cav. Roadsides and waste ground; native of China. 



3. Callirhoe Nutt. — Poppy Mallow 



1. Leaves triangular or halberd-shaped, crenate; plants stellate-pubescent; car- 

 pels pubescent, not rugose; petals 2-2.5 cm. long; sandy soil, rare. June- 

 Sept C. triangidata (Leavenw.) Gray 



1. Leaves round-cordate, palmately 5-7-parted; plants glabrous, or sparingly 

 pubescent at the base; carpels rugose, scarcely pubescent; petals 1.5-2 cm. 

 long; dry gravelly soil, rare. Peoria (Brendel, McDo7iald) , where prob- 

 ably adv C. digitata Nutt. 



4. Napaea L. — Glade Mallow 

 N. dioica L. Alluvial soil, local, throughout the n. half of III. July-Aug. 



5. Malvastrum Gray 



(Sidopsis Rydb.) 

 M. angustuDi Gray. Dry ground, rare. La Salle Co. July-Aug. [Sidopsis 

 hispida (Pursh) Rydb.; S phaeralcea angusta (Gray) Fern.} 



