Jhutllo/l.'j XXI. MALVACEAE. 199 



American. Of the 18 Australian species, three are widely distributed over tropical Asia and 

 Africa ; one, J. Jvicenn^^ is Mediterranean and Asiatic, hut scarcely tropical ; one, 4. av.rifinn^ 

 extends only to the fudiaii Archipelago ; one, A. crispum^ is coiumon to both the New and the 

 Old World, and the remaining 12 are endemic. The genus has frequently been united with 

 Sida, but the cliaracters derived from the diverging carpels with more than 1 ovule in each, 

 as contrasted with the converging uuiovulate carpels of Siddy are too constant and convenient 

 to be neglected, in groups so very numerous in species. The differential characters given to 

 several of the following s])ecle3 from the tropical regions, or from the deserts of the interior, 

 are as yet very unsatisfactory, owing to the imperfect state of many of the specimens, often 

 mere fragments. 



§ 1- Capsule inuicaie or concave at the top. Carpels (usiially 2- or Z-seededJ anonlar' 

 pointed or awued at the upper outer edge, persistent^ or rarety at length deciduous leaving 

 the filiform placenta attached to the axis. 



Carpels (usually 10 or fewer) not exceeding the calyx-lobes, the 

 points erect, or rarely divergent. Stems usually (perhaps always) 

 shrubby. 

 Calyx-lobes shorter than the tube. 

 Petals adnate high uj) the glabrous stamiaal tube. Calyx 



tubular, 1 in. long , 1. ^. tuhidosim. 



Petals shortly adnate to the pubescent base of the stamiual 

 tube. 

 Calyx 1 in. long, campanulate, lobes acute, nearly as long as 



the tube. Petals twice as long 2. J. amphtnu 



Calyx i to I in., lobes acuminate or rather obtuse, spread- 

 ing, much shorter than the tube. 



Petals above 1 in. long 3, ^. Jeiicopetaluau 



Petals shortly exceeding the calyx ^. A. Mitchelli, 



Calyx about 4 in., rather inflated, truncate, sinuate, or wiLh 

 very short obtuse lobes. 

 Petals veiy small. Stamiual column much longer than the 



calyx 5. ^. micropetalum. 



Petals very small or shortly exceeding the calyx, the 



stamiual culiuun not long 6. ^i. crgptopetahm. 



Petals twice as long as the calyx. Leaves deeply lobed , 7. A. geranioides, 

 (The last 2 species with more slender branches and a 

 closer hoary tomentum than A, viicropetalum,) 

 Calyx-lobes longer thau the tube or cup, acuminate. 



Calyx-lobes very concave and prominciilly keeled. Carpels 



^ about 10, scarcely acuminate ' 8. ^. otocarpnm. 



Calyx-ribs or angles searcclv promiueat. Carpels 4 or 5, acu- 

 minate \ 9. A. subviscosum. 



Carpels usually exceeding the calyx-Iobcs, the points often divergent. 

 Herbs usually tali, sometimes hard, almost woody at the base. 

 Stems coarse and erect. Leaves broadly cordate. 



Capsule truncate. Carpels numerous, the points very short. 

 Tomentum close and dense, usually without spreading 

 hairs. 

 Stipules small and subulate. Flowers mostly axillary . . 10. A. indicnm. 

 Stipules broadly scmisngittate. Flowers in terminal leafless 



racemes or pauirlcs 11. ^. auritum. 



Caj)su]c truncate. Carpels about 10, with long divergent points. 



Pubescent or loosely tomcntose 12. vf. Acicenna. 



Capsule contracted and angular at the top. Carpels numerous, 

 without points. Tomentum dense, mixed with long sprciid- 



inn- hairs ... 13. A. graveolcits. 



Sterns rather slender. Leaves ovate or cordate-lanceolate. Capsule 



truncate, with short divergent points 14. i. oxgcarpam. 



