WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 243 
Order 25. RANALES. 
KEY TO THE FAMILIES. 
Stamens 6; anther sacs opening by hinged 
valves 2.2.2.0... cee eee eee ee cee eens 53. BERBERIDACEAE (p. 258). 
Stamens numerous; anther sacs opening by 
slits. 
Flowers moncecious, 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. CERATOPHYLLUM L. Hornworr. 
A submerged aquatic; leaves whorled, finely dissected; flowers minute, axillary, 
sessile, Moncecious, 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 
stamens, the anthers large, sessile; fruit a smooth achene, with a long persistent beak. 
1. Ceratophyllum demersum IL. Sp. Pl. 992. 1753. 
Type Loca.ity: ‘“ Habitat in Europae fossis majoribus sub aqua.”’ 
Rance: 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. 
Posterior sepal spurred................-- - 1, DevLpHtnium (p. 244). 
Posterior sepal hooded, helmet-shaped or poat- 
shaped. ... 2... cece eee cece c eee eee 2. Aconitum (p. 247), 
Flowers regular. 
Petals conspicuous, produced into a spur at 
the base; leaves ternately compound; 
flowers showy............0-----0---05- 3. AQUILEGIA (p. 248). 
Petals inconspicuous or none, not spurred; 
leaves simple or ternate; flowers showy 
or small. 
Fruit of follicles; leaves simple; flowers 
solitary........2.-0.20-20-e eee eee 4, CALTHA (p. 249). 
Fruit a berry; leaves ternately compound; 
flowers racemose..........-200200 5, AcTAEA (p. 249). 
Carpels 1-ovuled; fruit an achene. 
Petals usually present. 
Sepals spurred; annuals; leaves all basal; re- 
ceptacle in fruit elongate-cylindric.... 6. Myosurus (p. 249). 
