GOOSEFOOT FAMILY 245 



4. C. villosum R . ib. Stem 2-4 dm. high, diflfusely branched from near 

 the base: leaves liii-ar, 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 

 margiQs; fruit 2.5-3 mm. long. 2 mm. wide. Sandv vallevs and fields: Sask. — 

 N.M. — -Ariz. — Ore.— Wash. Plain — Sahmord. JVS. 



7. ATRIPLEX ,Tourn., L. Orache, Salt-bttsh, Shad-scales. 

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

 pubescence. Leaves alternate or some opp>osite. Flowers monoecious or di- 

 oecious, in axiUarj- or ter mi nal panicles, or congested axiUarA- spikes. Staminate 

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

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

 or less tmited bracts, which are entire or toothed, often crested, tuberculkte, or 

 winged on the back. Cal}-x wanting. Ovar>- 1-ceUed: stigmas 2, subulate or 

 filiform. L'tricle wholly- or partly enclosed in the accrescent bracts. Seeds 

 erect or nearly horizontal. Endosperm mealy. 



Annuals. 



Bracts united only at the base: radicle inferlM". 



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



Bracts thick, deltoid or lanceolate, acute. 



Leaves not hastate. 2. A. lapathifolia. 



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



Bracts united to about the middle: radicle superior. 



Bracts lanceolate or lance-oblong, not tubercled cm the back: oft«i ladniate 



below. 4. A. phyllostegia. 



Bracts broader: if narrow, broadest above the middle. 



Bracts broadly ctmeate. truncate at the apes, seldom with tubercles. 

 Leaves triangular or cordate-ovate. 



Plant low, decxmibent, 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 ai)es: fruit short-i)eduncled ; leaves 



cordate-ovate. 6. A. saccaria. 



Bracts blimtly 3-toothed at the herbaceous apex; fruit subsessQe; 

 leaves more triangular-ovate. 7. .4. truncaia. 



Leaves linear. 8. A. VTol^i. 



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, mixed with the pistUlate ones. 



9- A. Caput-Medusae. 

 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 ta-ete or nearly so. 



10. -4. rosea. 

 Bracts suborbictilar, as broad as long: branches distlnctlv round- 

 cmgled. 

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

 very thin, usually cuspidate-actuninate: staminate spikes, 

 if present, elongated. 11. .4. expansa. 



Leaves petioled, firmer, acute; staminate spikes, if presoit. very 

 short. 12. .4. argeniea. 



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 thick ap- 

 pendages. 13. .4. Powellii. 

 Leaves obscurely ribbed; bracts without dorsal appendages. 



14. .4. Rydbergii. 

 Leaves 1-ribbed: branches spreading, slender. 



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



below the middle. 15. .4. lenuissima 



Leaves linear. .-1, mm. long; bracts ovate-oblong, tubratded 

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



Perennials. 



Bracts not winged on the back. 



Plant monoecious: lateral wings decmrent on the pedicels. 17. A. graciUiHora. 

 Plant dioecious: lateral wings not decmrent. 



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

 out appendages on the back. 

 Bracts small. 3—1 mm. long, longitudinally veined. 



Bracts imited to above the middle: shrub not spinescent. 



15. .4. ientiformis. 



1 



