22 KEY TO THE GENERA OF MANHATTAN PLANTS. 



Order 58. MALVACEAE. 



Carpels 5 to many, united in a ring and separating at maturity, or 

 forming a several-celled capsuie. Pedicels jointed. Seeds kidney- 

 shaped. Herbs. 



146. Abutilon. Carpels several (12 10), separating from the central 

 axis and from each other, dehiscent at apex, (pubescent, beaked, seeds 

 about 3 in each carpel). 



147. Malva. Carpels several, indehiscent, beakless, 1-seeded, calyx 

 lobes 5 with a 3-leaved involucel. 



148. Callirrhoe. Carpels as in Malva, but beaked on inner angle, and 

 the beak separated by a partition (indehiscent). Involucel 3-leaved or 

 more. 



149. Malvastrum. (Carpels 5, 1-seeded, kidney-shaped, softly hairy. 

 Calyx with a 3-leaved involucel. Seeds smooth ) 



150. Sida. No involucel, (carpels 5, 1-seeded, dehiscent at apex, en- 

 closed in inflated calyx, beaked, tardily separating). 



151. Hibiscus. Carpels united into a 5-celled, loculicidal capsule. 

 Involucel several leaved. (Calyx inflated, hairy, veiny. Seeds black, 

 slightly tuberculate.) 



Order 59. HYPERICACEAE. 



152. Hypericum. (Capsule 1-celled, septicidally 3-valved, with num- 

 erous seeds on 3 parietal placentae. Sepals 5, inferior, persistent. Herbs.) 



Order 60. CISTACEAE. 



Capsule 1-celled, with (3) parietal placentae, loculicidally (3) valved. 

 Herbs. 



153. Helianthemum. (Capsules of the earlier flowers with valves widely 

 spreading, 5 mm long, several seeded ; of the later flowers considerably 

 smaller, and the valves spreading only slightly, few seeded.) 



154. Lechea. Capsule (H mm long) imperfectly 3-celled by the intrusion 

 of the placentae. Seeds 2 on each placenta. 



Order 61. VIOL ACE AE. 



Capsule 1-celled, loculicidally 3 valved, placentae 3, parietal, on the 

 middle of the valves. (Capsule obtusely 3-angled, dehiscing violently, 

 the valves becoming boat-shaped and widely spreading.) Sepals persis- 

 tent, inferior. Herbs. 



155. Viola. Sepals auricled. Seeds numerous (ovate, smooth, hard, 

 with a round scar at base and a linear scar at apex. Capsule 4-1 cm long). 



156. Calceolaria. Sepals not auricled. (Capsule 6 mm long, 5 mm 



wide, about 6-seeded. Seeds globose, slightly flattened, nearly black, 



2 mm wide ) 



Order 62. LOASACEAE 



157. Mentzelia. Capsule inferior, 1-celled. with 3 parietal placentae, 



