316 MALVACEAE (MALLOW FAMILY) 



with bloom, about 8 mm. in diameter: seeds 2-4. Vitis riparia. RIVER- 

 BANK GRAPE. On stream banks; eastern Wyoming, Colorado, and eastward. 



2. PARTHENOCISSUS Planch. VIRGINIA CREEPER 



Climbing or trailing by tendrils which are often tipped with adhering disks 

 but in ours with naked tips. Leaves palmately 5-7-compound. Flowers in 

 compound cymes or panicles. Calyx slightly 5-toothed. Petals concave, 

 thick and expanding before they fall. Berry 2-3-seeded, not edible. 



1. Parthenocissus vitacea A. S. Hitch. Spring Fl. Man. 26. 1894. Tendrils 

 without terminal adhering disks, climbing by the coiling of the naked tips: 

 leaflets oblong-lanceolate to ovate, rather sharply and deeply serrate, dark 

 green above, only slightly lighter below: berries nearly black. Ampelopsis 

 quinquefolia in part. Also called AMERICAN IVY. Eastern Wyoming, Col- 

 orado, and southward. 



72. MALVACEAE Neck. MALLOW FAMILY 



Mostly herbs, with mucilaginous juice. Leaves stipulate, alternate, gen- 

 erally palmately ribbed. Peduncles axillary, the flowers usually showy. 

 Calyx 5-parted, obovate, often involucellate. Petals 5, convolute, their bases 

 or short claws united with each other and to the base of a column of nu- 

 merous monadelphous stamens. Anthers reniform, 1-celled, borne at the top 

 (in ours) of the stamen column. Ovary several-celled; the styles united be- 

 low but free above, usually projecting from the stamen-column. Fruit cap- 

 sular; the carpels around a common axis, each 1-many-seeded, falling away 

 entire, or loculicidally dehiscent. 



Style-branches filiform, longitudinally stigmatic. 



Petals cuneate, truncate-erose at apex . . . . . . .1. Callirhoe 



Petals obcordate; carpels beakless. 



Leaves merely crenate ......... 2. Malva. 



Some or all of the leaves lobed or parted ...... 3. Sidalcea. 



Style-branches with capitate stigmas. 



Carpels 1 -seeded .......... 4. Malvastrum. 



Carpels 2-several-seeded. 



Involucels 3-bracted 5. Sphaeralcea. 



Involucels none 6. Abutilon. 



1. CALLIRHOE Nutt. 



Herbs, generally with lobed or divided leaves. Flowers showy, axillary or 

 in racemes. Calyx either naked or 3-bracted. Petals cuneate, truncate at 

 apex. Styles stigmatic down the inner side. Carpels 10-20, with nearly 

 straight beaks. 



1. Callirhoe involucrata (T. & G.) Gray, PL Fendl. 16. 1848. Hirsute: 

 stem branching, procumbent: leaves deeply 3-5-parted, covered with stellate 

 hairs; the segments linear-lanceolate, laciniately 3- 5-toothed: peduncles 

 erect, 1 -flowered, longer than the leaves: sepals nearly twice as long as the 

 linear-lanceolate bracts of the involucel: petals scarlet or purplish-red, 2 cm. 

 long or more: carpels about 20, hairy, somewhat rugose-reticulated. Col- 

 orado and southward. 



2. MALVA L. MALLOW 



Herbs with rounded and mostly lobed leaves and axillary fascicled flowers. 

 Calyx 3-bracted. Petals obcordate. Styles numerous, stigmatic down the 

 inner side. Fruit depressed, separating at maturity into 1-seeded, blunt reni- 

 form carpels. 



