10 KEY; TO FAMILIES. 



Leaves opposite, small or prostrate herbs. 

 Calyx of 5 distinct sepals; stamens 3 to 5. 



Fruit an achene or utricle; stipules scarious.CARYOPHYLLACEAE, p. 150. 



IVuit a 3-valved capsule; stipules setaceous Loeflingia, p. 157. 



Calyx 5-clefl ; capsule circumscissile; stipules laciniate; stamens 1 to 3. 



Cypselea, p. 149. 

 Stipules nont . 



Fruit an achene or utricle 

 Leaves opposite or whorled. 



Calyx tubular, corolla-like, the base of the tube hardening and enclos- 

 ing the achene; prostrate maritime herbs. . NYCTAGINACEAE, p. 147. 

 Calyx of 6 (rarely 5) distinct often petal-like sepals; fruit a 3-sided 

 or lenticular achene; Eeaves opposite or whorled 



POLYGONACEAE, p. L28. 



Leaves alternate or opposite. 

 Calyx of 5 or fewer sepals. 



Sepals herbaceous or, in unisexual flowers, the pistillate without 

 calyx and enclosed by two bracts ; bractlets none ; mostly scurfy 

 plants of alkaline or maritime habitat . Chkxopodiaceae, p. 139. 



Sepals membranous or scarious; flowers with bractlets 



Amarantaceae, p. 147. 



Calyx 6-parted; flowers borne in an involucre ERIOGONUM, p. 131. 



Fruit a capsule; leaves opposite or whorled. 

 Calyx 5-merous. 



Ovary 3 to 5-celled Aizoaceae, p. 148. 



( )vary 1-celled Glaux, p. 316. 



Calyx 4-merous; diminutive annual SAGINA apetala, p. 155. 



Pistils more than 1 and distinct, becoming achenes. 



Sepals unarmed, commonly 5, distinct, often petal-like; stamens many; 



achenes several R axuxculaceae, p. 164. 



Calyx-tube armed with barbed prickles, its limb 3 to 7-parted; leaflets pin- 

 natifid; achenes 1 or 2 A.CAENA, p. 210. 



f f Calyx and corolla both wanting; pistil 1. 

 Blowers perfect, borne in a spike, subtended by a conspicuous colored involucre; 



herb of saline habitat Anemopsis, p. 116. 



Blowers monoecious. 



Terrestrial plants; flower-clusters often surrounded by a petal-like involucre 

 resembling a perianth; stamens 1 to many; capsule 3 (or 1) -celled; 



juice often milky Euphorbiaceae, p. 244. 



Aquatic plants; leaves opposite; stamen 1. 



Leaves dissected; ovary 1-celled, in fruit a Bpinose or tuberculate achene.. 



CeratopbyLLACEAE, p. 162. 



Leaves entire; ovary 1 celled, splitting when ripe into 4 parts 



Callitrichackak. p. 247. 

 b. Ovary inferior, i. < .. more or less adherent to ili< calyx. 

 Blowers dioecious or the pistillate with stamens; stamens 8 to 12; capsule 1- 



celled; Leaves alternate, divided DaTISCACEAE, p. 269. 



Blowers perfect. 

 Leaves renifora or cordate; calyx-lobes 3, caudate; capsule 6-celled ; nearly 

 acaulescenl Asarum, p. 306. 



