FLOWERING PLANTS AND FERNS OF ARIZONA 529 



7. Ditaxis serrata (Torr.) Heller, Cat. North Amer. PL 5. 1898. 



Aphora serrata Torr., U. S. and Mex. Bound. Bot. 197. 1859. 

 Ditaxis odontophylla Rose and Standi., Contrib. U. S. Natl. 

 Herbarium 16: 12. 1912. 



Yuma Mesa and Mohawk (Yuma County), 200 to 300 feet, sandy 

 soil. Southwestern Arizona, Sonora, and Baja California. 



Leaves mostly broadly cuneate-spatulate with truncate coarsely 

 toothed apices. 



5. BERNARDIA 



Deciduous shrub; leaves slightly greener above, petiolate, alternate; 

 stipules fleshy, acuminate, small; flowers dioecious; staminate flowers 

 2 to several in the axil of each bract of the short lateral racemiform 

 panicles, the calyx lobes 3 or 4, the stamens 3 to 6, the filaments dis- 

 tinct; pistillate flowers solitary, terminal, the sepals 5, the ovary 

 3-celled, the ovules solitary, the styles 3, short, verrucose, bifid; seeds 

 medium sized, not carunculate. 



1. Bernardia incana Morton, Wash. Acad. Sci. Jour. 29: 376. 1939. 

 Grand Canyon (Coconino County) and southern Yavapai County, 

 to Cochise, Pima, and Yuma Counties, 1,600 to 5,000 feet, dry rocky 

 slopes. Arizona and southeastern California. 



6. ACALYPHA 



Herbs or shrubs; leaves alternate, simple, petioled; stipules small; 

 inflorescence of terminal or axillary spikes or spiciform racemes, 

 entirely staminate, or staminate above and pistillate below, or wholly 

 pistillate; staminate flowers several to numerous in the axil of each 

 bract, pedicelled, the sepals 4, the stamens 6 to 8, the filaments dis- 

 tinct, the anther cells linear; pistillate flowers sessile, 1 or 2 in the 

 axil of each bract, the sepals 3, the carpels 3 or rarely 2, the ovules 

 solitary, the styles 3, distinct, dissected into filiform segments; capsule 

 usually 3-celled; seeds small, ovoid, with small caruncles. 



Key to the species 



1. Plants herbaceous, annual (2). 



2. Pistillate bracts pectinately toothed; seeds 2 to 2.3 mm. long. 



1. A. OSTRYAE FOLIA. 



2. Pistillate bracts shallowly toothed; seeds 1.2 to 1.4 mm. long (3). 

 3. Pistillate bracts obscurely veined, evenly toothed all around. 



2. A. INDICA. 

 3. Pistillate bracts conspicuously veined, the middle tooth markedly pro- 

 longed 3. A. XEOMEXICANA. 



1. Plants shrubby or suffrutescent (4). 



4. Leaf bases cordate to truncate; pistillate bracts with 9 to 17 small obtuse 

 teeth; inflorescence heavily covered with stipitate glands. 



4. A. PRINGLEI. 



4. Leaf bases broadly cuneate; pistillate bracts with not more than 6 large 



acute teeth; inflorescence with a few glands on the pistillate bracts 



only 5. A. lindheimehi. 



1. Acalypha ostryaefolia Riddell, Syn. Fl. West. States 33. 1835. 



Cochise, Santa Cruz, and Pima Counties, 3,200 to about 5,000 feet, 

 rich woods, not common. New Jersey to Florida, west to southern 

 Arizona and Mexico. 



