WOOTON" AND STANDLEY FLORA OF NEW MEXICO. 243 



Order 25. RANALES. 



KEY TO THE FAMILIES. 



Stamens 6; anther sacs opening by hinged 



valves 53. BERBERIDACEAE (p. 258). 



Stamens numerous; anther sacs opening by 

 slits. 

 Flowers monoecious, minute, sessile; an- 

 thers with hornlike appendages; 



plants submerged 51. CERATOPHYLLACEAE (p. 243). 



Flowers usually perfect; anthers not with 

 hornlike appendages; mostly land 

 plants, rarely aquatics 52. RANUNCULACEAE (p. 243). 



51. CERATOPHYLLACEAE. Hornwort Family. 



1. CERATOPHYLLTJM L. Hornwort. 



A submerged aquatic; leaves whorled, finely dissected; flowers minute, axillary, 

 sessile, monoecious, without floral envelopes but surrounded by an 8 to 12-cleft invo- 

 lucre; fertile flowers consisting of a simple 1-celled ovary, the sterile with 10 to 20 

 6tamens, the anthers large, sessile; fruit a smooth achene, with a long persistent beak. 



1. Ceratophyllum. demersum L. Sp. PI. 992. 1753. 

 Type locality: " Habitat in Europae fossis majoribus sub aqua." 

 Range: Throughout temperate North America, and in Europe. 

 New Mexico: Mangas Springs; San Augustine Ranch. In slow-flowing streams. 



52. RANUNCULACEAE. Crowfoot Family. 



Herbs or sometimes woody plants, with colorless, often bitter juice and polypetalous 

 or apetalous flowers, the calyx often corolla-like; stamens numerous; pistils many or 

 few, rarely single, distinct; flowers regular or irregular; sepals 3 to 15; fruit of dry 

 pods or of achenes or berries. 



KEY TO THE GENERA. 



Carpels with several ovules; fruit a follicle or berry. 

 Flowers irregular. 



Po-torior sepal spurred 1. Delphinium (p. 244). 



Posterior sepal hooded, helmet-shaped or boat- 



ehaped 2. Aconitcm (p. 247). 



Flowers regular. 



Petals conspicuous, produced into a spur at 

 the base; Leaves ternately compound; 



flowers ehowy 3. Ao.uii.eoia (p. 248). 



Petals inconspicuous or none, not spurred; 

 leaves simple or ternate; flowers showy 

 or small. 

 Fruit «if follicles; leaves simple; flowers 



solitary 4. Cajltha (p 249). 



Fruit a berry; leaves ternately compound; 



flowers racemose •'-■ Aotaka(p 



( Sarpels 1-ovuled; fruit an achone. 

 Petals N ikiIIv presenl . 



Sepals spurred; annuals; Leaves all ba al; re- 

 ceptacle i" trail elongate-cj lindric.. .. 8. Mtosobus (p. 24 



