KEY TO THE GENERA OF MANHATTAN PLANTS. 15 



48. Chenopodium. Calyx 5-parted. Seed lenticular (horizontal.) Utricle 

 indehiscent, but sometimes easily breaking away. 



49. Cycloloma. Calyx 5-parted. partially enclosing the horizontal fruit, 

 the lobes furnished with a continuous, scarious, horizontal wing. 



50. Monolepis Sepal 1. Seed vertical, lenticular. 



51. Salsola. Calyx 5-parted, each division with a broad, scarious wing 

 on back. Seed horizontal, lenticular. 



Order 25. AMARANTACEAE. 



Fruit much as in Chenopodiaceae, but imbricated with scarious 

 bracts Herbs. 



51a. Amaranthus. Bracts 3, sepals 3-5 (utricle dehiscent by a circum- 

 cissile line, 2-3 beaked. Seed horizontal). 



52 Acnida. No calyx. Utricle circumcissilly dehiscent. Seed vertical. 



53. Froelichia. Bracts 3. Calyx tube 5-cleft, 2-winged and woolly 

 with long hairs, enclosing the indehiscent utricle. 



Order 26. PHYTOLACCACEAE. 



54. Phytolacca Berry 10-celled, 10-seeded, dark purple, the 5 sepals 

 persistent at base and the 10 styles at summit. Seeds vertical. Herb. 



Order 27. N Y CT AGIN ACE AE. 



55 Allimria. Fruit nut-like, 1-celled, 1-seeded, indehiscent, tightly 

 enclosed in the persistent base of the calyx tube, 3 to 5 together in a 5- 

 lobed membranous involucre, ribbed or angled. Herbs. 



Order 28. AIZOACEAE. 



56. Mollugn; Capsule 3-celled, loculicidally 3-valved, partitions separ- 

 ating from the axis, sepals 5, inferior, persistent. Seeds several. Herb. 



Order 29. PORTULACACEAE. 



57. Portulaca. Capsule 1-celled. circumcissilly dehiscent, through the 

 pericarp and the two enclosing sepals. Placenta basal, seeds numerous, 

 attached by slender stalks. Herbs. 



Order 30. CARYOPHYXLACEAE. 



Capsule 1-celled (enclosed in the calyx tube). Placenta central or 

 basal. Seeds usually many. Herbs. 



58. Silene. Capsule sometimes 3-celled at base (6-valved at summit). 

 Seeds several. 



59. Saponaria. Capsule 4-valved at summii (seeds about 4). 



Order 31. ANONACEAE. 



60. Asimina. Fruit an oblong berry, with several large, flat, hori- 

 zontal seeds (solitary or 2-3 on a receptacle, yellowish-green about 1 dm 

 long). Small tree. 



