312 ANACARDIACEAE (SUMAC FAMILY) 



4-celled, with 2 styles. Fruit 4-lobed, flattened, and emarginate. Flowers 

 mostly solitary, sometimes a stamen and a pistil in the same axil. 



1. CALLITRICHE L. 



Characters given under the family. 



Bracts present; emersed leaves obovate 1.0. palustris. 



Bracts wanting; all leaves linear 2. C. bifida. 



1. Callitriche palustris L. Sp. PL 969. 1753. Aquatic or growing in the 

 mud, with elongated stems, and floating, rosulate, obovate often emarginate 

 leaves; the submerged ones linear or nearly so: bracts often exceeding the 

 fruit: styles erect or spreading, deciduous: fruit orbicular or obcordate, of 

 connate carpels, more or less winged. C. verna. Across the continent. 



2. Callitriche bifida (L.) Morong, Mem. Torr. Club 5: 215. 1894. En- 

 tirely submerged: leaves linear or linear-lanceolate, clasping at the base: 

 flowers without bracts: styles reflexed, deciduous: fruit round, deeply notched, 

 sessile, broadly winged on the margins. C. autumnalis. Across the conti- 

 nent in the northern part of our range. 



66. LIMNANTHACEAE Lindl. FALSE MERMAID FAMILY 



Glabrous annual herbs, with pungent juice, dissected alternate leaves with- 

 out stipules, and pale, regular, symmetrical flowers. Sepals valvate, persistent, 

 and accrescent. Petals withering-persistent. Stamens twice as many as the 

 petals, those opposite the petals having a gland at the base outside. 



1. FLOERKIA Willd. 



Flowers solitary at the ends of bractless axillary peduncles, 3-5-merous. 

 Carpels 1-ovuled, distinct, the 5-lobed style rising from the center, in fruit 

 becoming semi-drupaceous, rugose-tuberculate nutlets. 



1. Floerkia occidentalis Rydb. Mem. N. Y. Bot. Card. 1: 268. 1900. Very 

 slender, less than 1 dm. high, glabrous: leaves pinnate, with 1-2 pairs of 

 .oblong leaflets: sepals ovate, acute: petals oblanceolate, about half as long 

 as the sepals: carpels two, sharply rugose-tuberculate. In wet places; west- 

 ern Wyoming, Utah and northwestward. 



67. ANACARDIACEAE Lindl. SUMAC FAMILY 



Shrubs or trees with acrid, resinous, or milky sap, alternate leaves without 

 stipules, and small, regular, commonly polygamous or dioecious flowers. Calyx 

 3-7-cleft. Petals the same number, imbricated in the bud. Stamens as many 

 or twice as many, inserted at the base of the disk. The free ovary 1-celled 

 and 1-ovuled but the styles often 3. Fruit generally a small drupe. 



1. RHUS L. SUMAC 



Leaves trifoliolate or pinnately compound. Sepals and petals usually 5. 

 Stamens inserted under the edge of a disk lining the calyx. 



Leaflets 11-31 .... . 1. R. cismontana, 



Leaflets 3. 



Large, rhombic ovate . . . . . . . . . 2. R. Rydbergii, 



Small, crenately lobed ... ...... 3. R. trilobate, 



