24 MALVACEAE. 



base. Petals alternate with the calyx lobes, hypo^ynous, convolute in 

 the bud. Stamens many, united at the base with the short claws of the 

 petals, filaments more or less monodelphous; anthers 1-celled, reniforro. 

 Pistils several; stigmas various. Ovaries circularily arranged or form- 

 ing a several-celled pod. 



* Carpels 5-20; united in a ring around a. central axis. 

 f Styles stigrnatic down the inside; carpels 1-seedcd. 

 Malva, Involucel of 3 bractlets ; carpels beakless; petals obcordate. 

 CAiA.iRKHOE. Involucel of 3 bractlets; carpels beaked : petals truncate. 

 Napaea. Involucel none ; flowers dioecious ; carpels beakless. 



f f Styles with terminal capitate stigmas; carpels 1-feiv-seedcd. 

 Abutilon. Involucel none : carpels 12-13, 3-seeded. 

 Sida. Involucel none ; carpels 1- seeded. 

 Malvastrcm. Involucel of 3 bractlets; seeds solitary, ascending, filling 1 lie cell. 



* * Fruit a 5-celled loculiuidal pod. 

 Hibcscus. Involucel of many bractlets; pod 5-celled, many-seeded. 



MALVA L. Mallow. Calyx 5-oleft. Involucel 3-leaved. Petals obeordate. 

 Styles many, stigrnatic down the inner side. Carpels as many as the styles, 

 blunt, depressed, 1-seeded. 



M.rotundifolia L. Common M. Root large, biennial; stems procumbent; 

 leaves on long petioles, round-reniform, cordate, obscurely 5-lobed. crenate; 

 flowers axillary; petals white, twice the length of the calyx; fruit depressed, 

 pubescent. Waysides and waste places; June-September; common. 



M. sylvestris L. High M. Stem 2-3 feet high, erect, branched; leaves 

 orbicular or reniform, sharply 5-7-lobed, erenate; flowers in axillary clusters; 

 petals 3 times the length of the calyx, reddish-purple; carpels wrinkled- 

 veiny. Waste places near gardens; June-July; rather infrequent; Fayette, 

 Scott, Muscatine, Johnson, Story, Shelby, and Emmet counties. 



M. crispa L. Curled M. An erect annual, glabrous or nearly so; leaves 

 nearly orbicular, with 5-11 shallow angular lobes, the margin dentate, 

 crisped and wrinkled; flowers small, sessile, in axillary clusters. Waste 

 places; infrequent; Winneshiek and Decatur counties. (M. verticillata crispa L.) 

 CALLlKRriOE Nutt. Herbs with lobed or divided leaves and axillary or 

 terminal flowers. Calyx deeply 5-parted, naked or with a 3-leaved involucel. 

 Petals ouneate, truncate, rose-purple. Styles 10-20, stigrnatic down the inner 

 side. Carpels as many as the styles, short-beaked, 1-seeded. 



C. involucrata Gray. Stems 1-2 feet long, from a large descending 

 tuberous root, procumbent or ascending, hirsute; leaves rounded, 5-7 palm- 

 ately-cleft or parted, segments incisely cut or lobed; flowers large, axillary, 

 on long peduncles; sepals long lanceolate, 3-5-nerved, longer than the invo- 

 lucel; carpels indehiscent, reticulated. Pry soil; May-August; locally fre- 

 quent; Scott and Shelby counties. In most cases apparently an escape from 

 cultivation. 



C. triangulata Gray. Stems from a tuberous root, erect, pubescent; 

 leaves triangular or halberd-shaped, crenate, sometimes heart-shaped and 

 lobed; involucel about as long as the short calyx; sepals ovate-lanceolate, 5- 

 nerved; flowers panicled, short-pedicelled, purple. Dry prairie soil; June- 

 August; reported from Iowa. The author has found the species near the 

 border. 



NAPAEA L. An erect perennial with 5-9-palmately-parted leaves and 

 small white flowers in leafy corymbose panicles. Calyx 5-cleft; involucel 

 wanting. Petals 5. alternate, entire. Flowers dioecious. Staminate flowers 



