Dicotyls or Exogenous Plants. 81 



L Genus TIL'-I-A. — Sepals o, petals 5, spatulate-oblong. stainens /^ 

 numerous, filaments cohering in 5 clusters; trees with soft, white 

 wood and tough inner bark; flowers in cymes, peduncles ligulate- 

 winged. 



Til'-i-a a-mer-i ca'-na L. Basswood. — Leaves large, green and glab- 

 rous, or nearly so, thickish; fruit ovoid. 



Til'-i-a ljet-er-o-phyl'-la Vent. White Basswood. — Like the preceding, 

 but leaves smooth and bright-green above, silvery-whitened with a 

 fine down underneath; fruit globose. 



LV. Order MAL-VA'-CE-yE. MALLOW FAMILY.— Herbs (our species) ; 

 leaves alternate, stipulate ; flowers regular, stamens numerous, mona- 

 delphous, their column united to base of petals. 



Involucel of o bractlets, ovaries united in a ring .Malva. 1 



Involucel of many bractlets, pod S-celled Hibiscus. 2 



1. Genus MAL'-VA. — Styles numerous; petals obcordate ; calyx 

 surrounded by .3 bractlets ; fruit depressed. 



Mal'-va ro-tun-di-fo'-li-a L. Common Mallow. — Stem procumbent; Aj, 

 leaves round-cordate, on very long petioles ; petals twice the length of ff 

 the calyx. 



Mal'-va syl-ves'-tris L. High Mallow. — Stem erect, 2-o ft. high, 

 branched ; leaves sharply 5-7-lobed ; petals thrice the length of the 

 calyx. 



2. Genus HI-BIS'-CUS.— Calyx o-cleft, surrounded by a row of 

 bractlets; styles united ; stigmas •'), capitate ; fruit a 5-celled pod. 



Hi-bis'-cus tri-o'-num L. Bladder Ketmia. Low, rather hairy, annual ; 

 leaves 3-parted, divisions lanceolate ; corolla sulphur-yellow with a 

 blackish eye ; fruiting-calyx inflated. 



LVL Order HY-PER-I-CA-CE-/E. ST. JOHN'S-WORT FAMILY.— Herbs 



or shrubs; leaves oppo.site or entire, dotted ; flowers regular, stamens 

 numerous, often collected into 3 or more clusters. 



1. Genus HY-PER'-I-CUM. — Flowers yellow; sepals and petals 5, 

 stamens sometimes in 3 or 5 clusters ; styles 3, often more or less 

 united into one ; pod 3-celled. 



