POLYPETALOUS EXOGENOUS PLAKTS. 179 



A. GiTiiAGO, L. Plant l°-2° high, wliitencd with long 

 appressed luiirs. iStciii forking ; pelaU obovate, emarginate, 

 shorter than the lobes of the calyx. Peduncles 4-0' long. 

 Floivers 1' wide. June and July, annual. 



23. MALLOW FAMILY. Order, Malvace^. 



Herhs or shrubs. Leaves alternate and stipulate. Flow- 

 ers with 5 sepals united at the base, A^alvate in bud, often 

 subtended by an involucel. Petals 5, hypogynous, united 

 at the bottom with the tube of the stamen. Stamens 

 numerous, monodelphous, i. e. united by their iilaments 

 into one tube. Aoitliers 1-celled, kidney- shaped. Pistils 

 several distinct or united, and stigmas various. 



Fruit a several-celled capsule, or a collection of 1-seeded, 

 in dehiscent carpels. 



This order contains many useful and agreeable plants — 

 Cotton (Gossypium) among clothing pilants, and OJcra, a 

 food plant; while all are mucilaginons, thus offering a 

 cooling and safe drink to those ill luith many of the diseases 

 incidental to our climate, ivhile almost every memher of the 

 order is more or less leaiitiful. 



TRIBES AND GENERA. 



Tribe I. Malveae. Carpels as many as the stigmas, 

 1-feiv-seeded, disposed in a circle around a central axis, 

 separating at maturity from the axis and from each other. 

 Anthers home at the apex of the column. 



* Carpels 1-seeded. 



+ Stigmas occvpyirig the inverface of the style. 



Malva. Carjjels leafless. No ptrocess ivithin. 

 Oallirrhoe. Carpels leaked, and bearing a dorsal pro- 

 cess above the seed within. 



t+ stigmas capitate. 



MALYASTRUif. Involuccl 2-3-leaved. Ovule peritropous 

 ascending. Radicle inferior. 



