GOOSEFOOT FAMILY 245 



4. C. villosum Rydb. Stem 2-4 dm. high, diffusely branched from near 

 the base; loaves linear, 2-4 cm. long, 1-3 mm. wide, cuspidate-mucronate; 

 spikes rather dense; bracts more or less imbricate, the lower linear-lanceolate, 

 5-10 mm. long, the upper ovate, acuminate, 4-5 mm. long, with broad scarious 

 margins; fruit 2.5-3 mm. long, 2 mm. wide. Sandy valleys and fields: Sask. — 

 N.I\I. — Ariz. — Ore. — Wash. Plain — Suhmont. Jl-S. 



7. ATRIPLEX (Tourn.) L. Orache, Salt-bush, Shad-scales. 



Annual or perennial herbs or low shrubs, with scaly or scurfy, often silvery 

 pubescence. Leaves alternate or some opposite. Flowers monoecious or di- 

 oecious, in axillary or terminal panicles, or congested axillary spikes. Staminate 

 flowers without bracts; sepals 3-5; stamens 3-5; filaments distinct or united; 

 anthers 2-celled, opening lengthwise. Pistillate flowers subtended by 2, more 

 or less united bracts, which are entire or toothed, often crested, tuberculate, or 

 winged on the back. Calyx wanting. Ovary 1-celled; stigmas 2, subulate or 

 filiform. Utricle wholly or ])artly enclosed in the accrescent bracts. Seeds 

 erect or nearly horizontal. Endosperm mealy. 



Annuals. 



Bracts united only at the base; radicle inferior. 



Bracts thin, rounded-ovate, mucronate. 1. A. hortensis. 



Bracts tliick, deltoid or lanceolate, acute. 



Leaves not hastate. , 2. A. lapathifolia. 



Leaves more or less hastate. 3. A. hastata. 



Bracts united to about the middle; radicle superior. 



Bracts lanceolate or lance-oblong, not tubercled on the back; often laciniate 



below. 4. A. phyllostegia. 



Bracts broader ; if narrow, broadest above the middle. 



Bracts broadly cmieate, truncate at the ape.x, seldom with tubercles. 

 Leaves triangular or cordate-ovate. 



Plant low, decumbent, 1 dm. high or less; leaves less than 2 cm. long. 



.5. A. subdecumbens. 

 Plant larger, 3-10 dm. high; leaves 1.5-2.5 cm. long. 



Bracts subentire, corky at the apex; fruit short-peduncled ; leaves 



cordate-ovate. 6. A. saccaria. 



Bracts bluntly 3-toothed at the herbaceous apex; fruit subsessile; 

 leaves more triangular-ovate. 7. A. truncata. 



Leaves linear. 8. A. Wolfii. 



Bracts rhombic-orbicular to triangular, conspicuously toothed on the margins 

 and usually appendaged or tubercled on the back. 

 Bracts with linear, subulate, or oblong appendages on the back. 

 Staminate flowers few, mi.\ed with the pistillate ones. 



9. A. Caput-Mcdusae. 

 Staminate flowers in terminal clusters. 6. A. saccaria. 



Bracts with triangular lobes and appendages. 

 Leaves thin, more or less toothed or hastate. 



Bracts ovate, acute, longer than broad; branches terete or nearly so. 



10. A. rosea. 

 Bracts suborbicular, as broad as long; branches distmctly round- 

 angled. 

 Leaves subsessile, only the lowest with short-winged petioles, 

 very thin, usually cuspidate-acuminate; staminate spikes, 

 if present, elongated. 11. A. expansa. 



Leaves petioled, firmer, acute; staminate spikes, if present, very 

 short. 12. A. argentea. 



Leaves ovate or oblong, entire, usually less than 2 cm. long. 

 Leaves more or less 3-ribbed; branches ascending. 



Leaves strongly ribbed; faces of the bracts with short tliick ap- 

 pendages. 13. .4. Powellii. 

 Leaves obscurely ribbed ; bracts without dorsal appendages. 



14. A. Rydbergii. 

 Leaves 1-ribbed; branches spreading, slender. 



Leaves ovate or oblong, 2-7 mm. long; bracts ovate, tubercled 



below the middle. 15. A. tenuissinia 



Leaves linear, 7-17 mm. long; bracts ovate-oblong, tubercled 

 at or above the middle. 16. A. Greenei. 



Perennials. 



Bracts not winged on the back. 



Plant monoecious; lateral wings decurrent on the pedicels. 17. .4. gracilliflora. 

 Plant dioecious; lateral wings not decurrent. 



Bracts with entire or merely wavy (rarely slightly denticulate) margins, with- 

 out appendages on the l)ack. 

 Bracts small, 3-4 mm. long, longitudinally veined. 



Bracts united to above the middle; shrub not spinescent. 



18. .4. Icntiformis. 



