FLOWERING PLANTS AND FERNS OF ARIZONA 659 



1. Cornus stolonifera Miclix., FL Bor. Amer. 1: 92. 180?. 

 Cornus instolonea A. Nels., Bot. Gaz. 53: 224. 1912. 



Apache County to Coconino County, south to Cochise and Pima 

 Counties, 6,000 to 9,000 feet, along streams, often with' willows and 

 alder, June and July. Canada and Alaska, south to the District 

 of Columbia, New Mexico, Arizona, and California. 



Red-osier dogwood, so called because the bark resembles that of 

 some willows. The fruits are very attractive to birds. 



93. LENNOACEAE. Lennoa family 



1. AMMOBROMA. 2 Saxdroot, saxdfood 



Plant without chlorophyll, a root parasite; stems thick, succulent, 

 subterranean; leaves reduced to scales; flowers regular, perfect, 

 small, very numerous on an expanded receptacle; sepals filiform, 

 plumose-hairy; corolla funnelform, its lobes normally 6 to 9; stamens 

 borne on the corolla. 



1. Ammobroma sonorae Torr. in A. Grav, Amer. Acad. Arts and 

 Sci. Mem. ser. 2, 5: 327. 1854. 



Southern Yuma County along the Mexican boundary {Harrison and 

 Kearney 8435), below 500 feet, drifting sand, April. Southwestern 

 Arizona, southeastern California, and northwestern Sonora. 



One of the most remarkable plants hi the Arizona flora. Only the 

 saucer-shaped receptacle is normally seen above ground. Tins is 

 commonly 3.5 to 12.5 cm. in diameter, about the color of the sur- 

 rounding sand, and thickly studded with tiny violet-colored flowers, 

 opening in successive circles. The long, succulent underground 

 stems are attached to the roots of various desert shrubs. They were 

 formerly much used as food by a western group of Papago Indians, 

 the "Sand Papagos," who ate them raw, roasted, or ground into meal. 



94. ERICACEAE. Heather family 



Plants of various habit, herbaceous to treelike, with or without 

 chlorophyll, often evergreen; flowers perfect, regular or nearly so; 

 corolla gamopetalous or the petals nearly separate; stamens free from 

 the corolla or nearly so; anthers mostly opening by terminal pores, 

 commonly awned; style 1; ovary superior or inferior; fruit dry or 

 juicy. 



Key to the genera 



1. Plants saprophytic, without green-coloring matter, yellowish brown or red; 

 leaves reduced to scales; anthers not beaked; style erect, stout (2). 

 2. Petals separate; anthers not awned, opening at apex; ovary borne on a 

 deeply toothed disk; seeds not winged but with taillike extensions of 



the coat 1. Moxotropa. 



2. Petals united below; anthers with 2 long dorsal awns, opening lengthwise; 

 disk none; seeds with a hyaline wing much larger than the body. 



2. Pterospora. 



2 Reference: Thackkkv. F. A., and < hi. man, M. V. a rake parasitic food plant of the southwest. 

 Smithsn. Inst. Ann. Rpt. 1930: 409-416. 1931. 



