76 CHENOPODIACEAE 



6. KOCHIA Roth. 



Perennial undershrubs; leaves linear-filiform, fleshy. 



Branches tomentiUose, soon glabrate; leaves somewhat hairy when young; fruit 

 nearly glabrous. 1. K. americana. 



Branches and leaves densely and permanently hairy; fruit very pubescent. 



2. K. vestita. 

 Annual; leaves lanceolate, not fleshy. 3. K, scoparia. 



6. CORISPERMUM (A. Juss.) L. Bug-seed. 



Fruit with a distinct wing, about 0.5 mm. wide. 



Spike lax ; lower bracts much narrower than the fruit. 1. C. nitidum. 



SpUces dense; lower bracts usually overtopping, and rarely narrower than the fruit. 



2. C. marginale. 

 Fruit merely acute-margined, scarcely at all winged. 



Plant glabrous. 3. C. emarginatum. 



Plant more or less villous. 4. C. villosum. 



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



Annuals. 



Bracts united only at the base; radicle inferior. 



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



Bracts thick, deltoid or lanceolate, acute. 



Leaves not hastate. 2. A. lapathifolia. 



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



Bracts imited 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 cuneate, truncate at the apex, 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-pedimcled; 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 liiiear, subulate, or oblong appendages on the back. 

 Staminate flowers few, mixed with the pistillate 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 terete or nearly so. 



10. A. rosea. 

 Bracts suborbicular, as broad as long; branches distinctly 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 aiscending. 



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

 pendages. 13. A. 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. tenuissima 



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. A. gracilliflora. 

 Plant dioecious ; lateral wings not decurrent. 



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

 out appendages on the back. 

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



Bracts united to above the middle; shrub not spinescent. 



18. A. lentiformis. 

 Bracts nearly free; shrub spinescent. 19. A. Torreyi. 



Bracts larger, 5-10 mm. long, not veined. 



Leaves reniform, coarsely sinuately dentate; free portion of the bracts 



reniform. 20. A. hymenolytra. 



Leaves entire; bracts not reniform. 



