90 



KEY TO THE FAMILIES AND GENERA 



. Carpels not appemlaged . . 18. Malta. 

 TW. Style-branches tipped with smalt 



capitate or club-shaped stigmas. . 19. Malcastrum. 

 EE. The ovules pendulous. 



F. Style-branches longitudinally stig- 



matose inside 20. Plogianthus. 



FF. Style-branches truncate at apex or 



with small capitate stigmas 21. Sida. 



Other genera described are Hoheria, Ingenhousia, Kitaibelia, 

 and Kosteletzkya. 



42. MALPIGHIACE^E. 



A. Fr. a fleshy 3-stoned drupe 1. 



AA. Fr. a caps, composed of 3 dehiscent berries: 



fls. in terminal racemes 2. Galpliimia. 



AAA. Fr. consists of 1-3 samaras: fls. in umbel-like 



corymbs 3. stigma phul- 



Other genera described are Byrsonima, Janusia, Sphedamno^ 

 carpus and Tristellateia. 



36. BOMBACACE./E. 



A. Lvs. digitate: cotyledons conduplicate or 



convolute. 

 B. Staminal column separated above into 



numerous filaments. 



c. Caps. 5-valved, densely woolly within ... 1. Bombax. 

 cc. Caps, woody, not woolly within. 



D. Calyx 5-cut 2. Adansonia. 



DD. Calyx truncate 3. Pachira. 



BB. Staminal column 5-cut or 5-toothed, the 



branches bearing 2-3 anthers. 

 C. Column outside below the middle annu- 



lately 5-10-Iobed 4. Chonsia. 



cc. Column not annulate 5. Ceiba. 



AA. Lvs. simple, feather-veined, entire: cotyledons 



plane, leafy or fleshy 6. Dvrio. 



37. STERCULIACE.S. 



A. Petals concave or hooded at the base. 



B. Anthers solitary between the staminodes 1. Rulingia. 



BB. Anthers 2 or more between the staminodes. 



c. Fr. a membranous caps 2. Abroma. 



cc. Fr. a woody caps 3. Guazuma. 



ccc. Fr. drupaceous 4. Theobroma. 



AA. Petals flat. 



B. The petals deciduous, 

 c. Anthers sessile ; calyx club-shaped or bell- 

 shaped 5. Renesia. 



cc. Anthers stipitate; sepals at length free.. 6. Pterosper- 

 BB. The petals persistent or marcescent. [mum. 



c. Anthers 10 or 15, rarely 20. 



D. Ovules 2 in each locule 7. Dombeya. 



DD. Ovules 8. Pentapetei. 



cc. Anthers 5 9 Mahernia 



AAA. Petals 0. 



B. Fls. bisexual 10. Fremontia. 



BB. Fls. unisexual or polygamous. 



c. Anthers crowded without order: seeds 



without endosperm 11. Sterculia. 



cc. Anthers in a single ring: seeds with en- 

 dosperm 12. Cola. 



Brachychiton, Chiranthodendron, and Heritiera are also treated 



43. ZYGOPHYLLACE.ffi. 



A. Ovary sessile: Ivs. with 2 Ifts., rarely 1 1ft. . . 1. Zygophyl- 

 AA. Ovary stalked: Ivs. abruptly pinnate 2. Guaiacum. 



44. GERANIACE.E. 



A. Fls. irregular, the posterior sepal spurred; 



spur adnate to the pedicel 1. Pelargon turn, 



AA. Fls. regular or nearly so. 



B. Stamens 10, usually all fertile: tails of car- 

 pels usually not bearded inside 2. Geranium. 



BB. Stamens, 5 fertile and 5 reduced to scales; 



tails of carpels usually bearded inside 3. Erodium. 



BBB. Stamens 15, anther-bearing, in groups of 5 . . 4. Af onsonia. 



4S. TROP.SOLACE./E. 



The only genus Tropaeolum. 



46. LIMNANTHACEJE. 



In cultivation LimnantHci. 



47. OXALIDACE.ffi. 



A. Fr. a loculicidal caps. 



B. Valves of caps, separating to the middle. ... 1. Oxalis. 



BB. Valves of caps, separating to the base 2. Biopkytum. 



AA. Fr. an indehiscent berry 3. Averrhoa. 



48. BALSAMINACEjE. 



In cultivation Impatient. 



38. TILIACE^. 



A. Calyx bell-shaped, 3^5-cut 1. Berria. 



AA. Calyx composed of distinct sepals. 



B. Petals pitted at the base, inserted around 

 the base of a more or less elevated torus, 

 c. Fr. unarmed, glabrous, or tomentose .... 2. Grewia. 



cc. Fr. echinate or setose 3. Triumfetta. 



BB. Petals not pitted, inserted immediately 



around the stamens. 



c. Fr. indehiscent globose, usually 1 -seeded... 4. Tilia. 

 cc. Fr. a caps. 



D. Caps, loculicidally dehiscent. 

 E. The stamens all bear anthers. 



F. The caps, globose, echinate 5. Entelea. 



FF. The caps, pod-like, usually naked. . 6. CorcAorus. 

 EE. The outer stamens have no anthers. . . 7. Sparmannia. 

 DD. Caps, dehiscing at the apex 8. Luehea. 



39. EL^OCARPACE^E. 



A. Fr. a berry 1. Aristotelia. 



AA. Fr. a drupe 2. Eteocarpus. 



AAA. Fr. a dehiscent loculicidal caps 3. Tricuspid- 



40. LINAGES. 



A. Styles 5: Ivs. entire: glands equal 1. Linum. 



AA. Styles 3-4: Ivs. usually serrate: glands usually 



unequal or absent 2. Reinwardtia. 



41. ERYTHROXYLACE^E. 



In cultivation Brythroij/lm. 



49. RUTACE.S. 



A. Ovary entire or slightly 2-5-lobed; style ter- 

 minal, entire at base: fr. drupe-like or berry- 

 like, but leathery, usually indehiscent. 

 B. Fls. hermaphrodite; petals and stamens 

 free or connate; ovules 1, 2 or many: fr. 

 usually with a cortex outside and pulpy 

 within; seeds ex-albuminous. (Subfamily 

 Citrata?.) 

 c. Cotyledons thin and twisted in seed: frs. 



dry 1. Micromelum. 



cc. Cotyledons thick and fleshy, plano-con- 

 vex: frs. more or less fleshy or pulpy. 

 D. Thorns absent: Ivs. pinnate; Ifts. alter- 

 nate on rachis: frs. fleshy berries. 

 E. Styles very short and thick, persis- 

 tent; fls. small, urceolate: young 

 growth densely covered with brown 



velvety pubescence 2. Glycosmis. 



EE. Styles long or, if short, dehiscent. 

 F. Fls. small : ovarial cells with scat- 

 tered hairs: frs. with thick fleshy 



dissepiments 3. Claucena. 



FF. Fls. large: ovarial cells with tufted 

 conducting hairs: frs. fleshy but 



with thin dissepiments 4. Chalcas. 



DD. Thorns usually present: Ivs. simple or, 



if compound, with the lateral Ifts. 



exactly opposite. (Tribe Citreaj. ) 



E. Frs. large, hard-shelled; cells filled 



with mucilage. (Subtribe ^Eglinee. ) 



F. Lvs. pinnate: ovary 5-celled but 



by confluence becoming 1 -celled. 



a. Seeds woolly; exocarp woody, 



continuous 5. Feronia. 



GO. Seeds smooth ; exocarp prismatic . 6. FeronitUa. 

 FF. Lvs. trifoliate or simple: ovary 

 6-15-celled. 



