618 MISC. PUBLICATION 4 2 3, TJ. S. DEPT. OF AGRICULTURE 



*2. Shepherdia argentea (Pursh) Nutt., Gen. PL 2: 241. 1818. 



Hippophae argentea Pursh, Fl. Amer. Sept. 115. 1814. 

 Lepargyraea argentea Greene, Pittonia 2: 122. 1890. 



The writers have seen no specimens from Arizona, but the plant has 

 been collected in northwestern New Mexico, near the border. Canada 

 to Kansas, New Mexico, and California. 



Silver bufTaloberry. 



3. Shepherdia canadensis (L.) Nutt., Gen. PL 2: 241. 1818. 



Hippophae canadensis L., Sp. PL 1024. 1753. 

 Lepargyraea canadensis Greene, Pittonia 2: 122. 1890. 



White Mountains, Apache County at Twelve Mile Creek, head of 

 the Little Colorado River, and Marsh Lake, about 9,000 feet (Coville 

 1130, Goodding 1155, Goldman 2466). Newfoundland to Alaska, south 

 to New York, New Mexico, Arizona, and Oregon. 



Russet buffaloberry. 



87. LYTHRACEAE. Loosestrife family 



Plants (Arizona species) herbaceous, annual or perennial; leaves 

 simple, entire, opposite or alternate, without stipules; flowers perfect, 

 regular or irregular, axillary or in terminal racemes or spikes; calyx 

 tube enclosing but free from the ovary ; petals and stamens borne on 

 the throat of the calyx; fruit a 1- to 4-celled capsule; seeds numerous. 



Key to the genera 



1. Calyx broad, campanulate or turbinate in flower, hemispheric to globose in 



fruit, not prominently ribbed; petals usually inconspicuous, sometimes 



wanting; leaves opposite; flowers axillary, solitary or in small short-stalked 



glomerules (2). 



2. Capsules regularly dehiscent longitudinally; leaves attenuate at base, short- 



petioled or subsessile 1. Rotala. 



2. Capsules bursting irregularly; leaves some or all of them auriculate-clasping 



at base 2. Ammannia. 



1. Calyx narrow, cylindric, tubular, or subclavate, with several longitudinal ribs; 

 petals usually conspicuous, normally rose purple (3). 



3. Plant perennial; herbage glabrous or obscurely puberulent; leaves mostly 



alternate, sessile or subsessile; flowers nearly regular; calyx almost 



symmetric, narrowly cylindric or subclavate in fruit 3. Lythrum. 



3. Plant annual; herbage glandular-hispid; leaves mostly opposite, petioled; 

 flowers irregular, the upper petals larger than the others; calyx oblique, 

 turgid in fruit, hispid 4. Cuphea. 



1. ROTALA 



Small annual herbs, glabrous or nearly so; leaves opposite, narrow; 

 flowers regular or nearly so, axillary, mostly solitary, small; bractlets 

 longer than (often twice as long as) the calyx, this short and broad, 

 with appendages often 3 times as long as the lobes; petals 4 and about 

 1 mm. long, or wanting; ovar} 7 ellipsoid; valves of the capsule minutely 

 transverse-striate. 



*1. Rotala dentifera (A. Gray) Koelme, Bot. Jahrb. 1: 161. 1880. 



Ammannia dentifera A. Gray, PI. Wright, 2: 55. 1853. 



The writers have seen no specimens from Arizona, but the type was 

 collected near Santa Cruz, Sonora, a few miles south of the inter- 



