44-0 MALVACEAE 



3. T. heterophylla Vent. In woods: N. Y. to Fla., Ala., Ky., 111. 

 and Tenn. 



Known only from the region near Slatington and Lehigh Gap, 

 Lehigh Co., Pa., an area with an elevation of about 800 ft., a 

 growing season of about 165 days and underlaid by Hudson River 

 and Utica shales. 



The common European linden, Tilia europaea L. is often planted and is a not in- 

 frequent escape, but is scarcely persistent. 



Corchorus tridens L. and C. trilocularis L. are rare waifs near New York and Philadel- 

 phia. 



MALVACEAE 



Stamen-column anther-bearing at the summit. 

 Carpels 1 -seeded. 



Involucels of 6-9 bractlets. 1. Althaea. 



Involucels of 1-3 bractlets, or none. 



Stigmas linear, on the inner side of the style-branches. 2. Malva. 

 Stigmas capitate, terminal. 3. Sida. 



Carpels 2-several-seeded. 4. Abutilon. 



Stamen-column anther-bearing below the entire or 5-toothed summit. 



Carpels I -seeded. 5. IvOSTELETZKYA. 



Carpels several-seeded. 6. Hibiscus. 



i. Althaea L. 

 1. A. officinalis L. In salt marshes: Mass. and N. Y. to Pa. 

 Naturalized from Europe. 

 Occasional as naturalized plant in some of our salt-marshes. 



A. rosea Car., the Hollyhock, is not infrequent as an escape in some parts of our range, 

 hardly ever becoming established. 



2. Malva [Tourn.] L. 



Leaves with 5-9 shallow, angular lobes. 



Petals 2-4 times the length of the calyx. I. M. sylveslris. 



Petals 1-2 times the length of the calyx. 



Procumbent, low. 2. M. rotundifolia. 



Erect, tall; leaf -margins crisped. 3. M. crispa. 



Leaves deeply 5— 7-lobed or pinnatifid. 



Stem leaves 1-3 pinnatifid; carpels downy. 4. M. moschata. 



Stems leaves deeply lobed; carpels glabrous. 5. M. Alcea. 



1. M. sylvestris L. In waste places and along roadsides: 



throughout N. Am. Adventive from Europe. 

 Rare as an adventive weed. 



2. M. rotundifolia L. In waste places: throughout E. N. Am. 



Naturalized from Europe. 



