Chenopodium Chenopodiaceae 421 



Leaves not entire, sinuately dentate; inflorescence dense; seed rugose-punctate, 

 1.5 mm in diam., black, shiny, lenticular, with acute margin; calyx lobes 



keeled and enclosing the fruit; plants up to 6 ft. tall 7. C. album. 



Leaves mostly entire. 



Leaves linear or nearly so, very mealy at least beneath, with short petioles; 

 seed black, shiny, punctate, asymmetrical; calyx lobes keeled, closely 



enveloping the fruit or erect; pericarp green or greenish 



8. C. pratericola. 



Leaves ovate, about as broad as long, small (1 cm long), on long petioles; 

 seed lenticular, with rounded margin, wrinkled and finely punctate, about 

 1 mm in diam.; pericarp adherent; plants very fetid, densely mealy. . . . 



9. C. Vulvaria. 



Leaves green or nearly so (except C. missouriense var. Busliianum) . 

 Seed larger than in other species, 1.5-2 mm (-3 mm max. in var.) in diam., 

 black, lenticular, margin more or less rounded, almost smooth or with 

 radial canals of varying depth or slightly granulate or with narrow 

 wrinkles; perianth tips slightly keeled, incompletely enclosing the fruit; 

 leaves with large divaricate (2-4) acute lobes, rounded or somewhat 

 cordate at base, 4-17 cm long, to 12 cm wide, 3-5-angular-ovate, acumi- 

 nate. 



Inflorescence panicled, loosely branched, leafless, and terminal 



10. C. gigantospermum. 



Inflorescence contracted, spicate 10a. C. gigantospermum f. Griffithsii. 



Seeds smaller. 



Pericarp not firmly attached to the seed. 



Perianth tips not completely enclosing the fruit, slightly keeled; pericarp 



rust brown, somewhat fleshy 11. C. Standleyanum. 



Perianth tips completely enclosing the fruit, prominently keeled; pericarp 

 yellow. 

 Leaves glabrous, 5x3 cm; inflorescence paniculate-glomerate 



12. C. missouriense. 



Leaves mealy beneath, mostly smaller; inflorescence glomerulate-cymose. 



12a. C. missouriense var. Bushianum. 



Pericarp firmly attached to the seed. 



Inflorescence short, spreading, axillary, rather loose, the panicles shorter 

 than the leaves; leaves ovate or ovate-rhombic; seed shiny (appearing 

 dull because of firmly attached pericarp), almost black, faintly 



punctate, with acute margin 13. C. murale. 



Inflorescence suberect, moniliform, flower clusters, at least the upper ones, 

 longer than the leaves; seed shiny, brownish black, almost smooth, 

 finely punctate, with rounded margin. 



Leaves deltoid, more or less hastate, base truncate or subcordate 



14. C. urbicum. 



Leaves longer than broad (often twice as long), base long-cuneate. 

 14a. C. urbicum var. intermedium. 



1. Chenopodium ambrosioides L. ssp. eu-ambrosioides Aellen. (Rep. 

 spec. nov. regn. veget. 26: 34. 1929.) (C. ambrosioides L. s. str.) Mexi- 

 can Tea. Map 860. A highly polymorphic species of wide tropical distri- 

 bution, but adventive in the temperate zones. Found mostly in gravelly 

 and sandy soil. 



Reported from: Fayette, Floyd, Gibson, Hamilton, Monroe, Porter, 

 Posey, and Putnam Counties. 



la. Chenopodium ambrosioides ssp. eu-ambrosioides var. anthel- 

 mInticum (L.) Aellen. (Rep. spec. nov. regn. veget. 26: 35. 1929.) (C. am- 



