274 MISC. PUBLICATION 42 3, IT. S. DEPT. OF AGRICULTURE 



short, interrupted, naked panicles of spikes; fruiting bractlets ac- 

 crescent, united except for a small apical orifice, 6-keeled, 2 of the 

 keels broader and winglike; stigmas 2, filiform, exserted; seed hori- 

 zontal. 



1. Zuckia arizotiica Standi., Wash. Acad. Sci. Jour. 5: 58. 1915. 



Adamana, Apache County {Griffiths 5085), Chalcedony Park 

 (Petrified Forest?), Navajo County (Zuck 39, the type collection), 

 near Tuba, Coconino County (Goodding 1503, Eastwood and Howell 

 6503), about 5,000 feet. Known only from northeastern Arizona. 



7. GRAYIA. Hop-sage 



Low, branched shrubs with stiff divergent branches; leaves with 

 oblanceolate, slightly fleshy blades; flowers unisexual, in glomerules, 

 these forming terminal or axillary spikes or panicles; fruits closely 

 subtended by a pair of conspicuous thin, flat-winged, connivent 

 bractlets, these united to the middle or higher; seeds vertical. 



The spiny hop-sage (G. spinosa) is an excellent browse plant 

 relished by all livestock, but not sufficiently abundant in Arizona to 

 be of much importance. 



Key to the species 



1. Fruiting bractlets at maturity glabrous, not carinate, more than 6 mm. wide; 



plant often spiny 1. G. spinosa. 



1 . Fruiting bractlets at maturity scurfy -pubescent, carinate, not more than 6 mm. 



wide; plant not spiny 2. G. brandegei. 



1. Grayia spinosa (Hook.) Moq. in DC, Prodr. 13 2 : 119. 1849. 



Chenopodium spinosum Hook., Fl. Bor. Amer. 2:127. 1838. 



Keam Canyon (Navajo County), near Kingman, Chloride, and 

 Oatman (Mohave County), 3,000 to 6,000 feet, flowering in spring. 

 Wyoming to Washington, south to Arizona and California. 



2. Grayia brandegei A. Gray, Amer. Acad. Arts and Sci. Proc. 11: 



101. 1876. 



Petrified Forest (Apache County), about 5,000 feet, in clay soil 

 (Hall 11167). Colorado, Utah, and northeastern Arizona. 



Hall's specimen has the bracts broader and more retuse than in 

 typical G. brandegei. 



8. EUROTIA. WlNTERFAT 



Plants shrubby or suffrutescent, stellate-tomentose ; leaves alter- 

 nate, entire, linear; flowers unisexual or perfect, in axillary clusters 

 and terminal spikelike inflorescences; perianth 4-parted; stamens 4; 

 fruiting bractlets united into a villous, 2-beaked tube. 



One of the most valuable native forage plants, especially as winter 

 feed for sheep. As implied by the vernacular name, livestock fatten 

 well on Eurotia. The plant is also known (erroneously) as " white 

 sage." Mrs. Collom reports that the Indians used the plant medic- 

 inally, applying the powdered root to burns and treating fever with 

 a decoction of the leaves. The plant avoids very saline soil. It is 

 of value for controlling soil erosion. 



