Chenopodium Chenopodiaceae 419 



Chenopodiaceae. North American Flora 21(1): 1-93. 1916. Ulbrich, E. 

 Chenopodiaceae. In Engler und Prantl, Die natiirlichen Pflanzenfamilien, 

 2. ed., 16c: 377-584. 1934.] 



Flowers perfect (or some of them pistillate) ; perianth mostly present. 



Stem not jointed; leaves flat, not spiny; flowers without bractlets; embryo annular 

 (or conduplicate), not spirally coiled; endosperm copious. 

 Flowers in clusters or panicles; calyx 3-5-toothed or -parted, obvious, persistent; 

 fruit enclosed by or not longer than the calyx. 

 Fruiting calyx wingless, herbaceous, green or reddish (sometimes red and 

 fleshy) ; perianth leaves free, naked ; fruit free, surrounded by perianth, not 

 hardened, indehiscent; leaves often mealy, lanceolate to ovate or deltoid 

 or pinnately lobed to pinnate; flowers with (2) 3-5 sepals and 2-5 stamens, 

 mostly in panicled spikes; endosperm mealy. .. .2223. Chenopodium, p. 419. 

 Fruiting calyx 5-cleft, horizontally winged. 



Flowers paniculate; perianth keeled, developing into a broad horizontal wing 

 at maturity; endosperm mealy; leaves ovate to lanceolate, flat, sinuate- 

 dentate, 2-7 cm long; annuals, to 80 cm high, branches divaricate 



2224. Cycloloma, p. 424. 



Flowers spicate; each sepal with a dorsal winglike projection; endosperm 

 absent; leaves linear or lance-linear, terete, entire. .2240. Kochia, p. 426. 

 Flowers solitary in the axils of the reduced upper leaves, forming terminal narrow 

 spikes, with 1-3 thin broad sepals; fruit oval, laterally flattened, distinctly 

 winged (wing 0.5 mm long or more), much larger than the calyx; pericarp 

 membranous, adherent to the vertical seed; leaves linear; caulescent annuals. . 

 2245. Corispermum, p. 426. 



Stem jointed, fleshy, squarrosely branched; leaves fleshy, narrow, subulate, spiny- 

 tipped; flowers 1-3 in axils of leaves, subtended by bractlets; stamens 5, free; 

 calyx in fruit with a horizontal wing; embryo spirally and conically coiled; 



endosperm none; stems striate 2269. Salsola, p. 427. 



Flowers imperfect (unisexual, monoecious or dioecious), pistillate flower without 

 perianth; stigmas 2 or 3, enclosed in 2 appressed triangular bractlets, these com- 

 pressed, free at least above; fruiting bracts with margins often dilated and sides 

 often muricate; utricles not winged at apex; testa coriaceous; staminate flowers in 

 clusters, mostly spicate; calyx 3-5-parted; embryo annular; leaves lanceolate to 

 hastate-ovate 2229. Atriplex, p. 425. 



2223. CHENOPODIUM [Tourn.J L. Pigweed, Goosefoot* 



[Aellen, P. Neue adventive Chenopodien aus Schweden. Bot. Not. (Lund) 

 1928: 203-210. 1928. Beitrag zur Systematik der Chenopodium-Arten 

 Amerikas, vorwiegend auf Grund der Sammlung des United States Na- 

 tional Museums in Washington, D. C. I. Rep. spec. nov. regn. veget. 26: 

 31-64; II. loc. cit. 26: 119-160. 1929. Die wolladventiven Chenopodien 



* The satisfactory identification of the species of Chenopodium is definitely de- 

 pendent upon the characteristics of the mature seeds. Consequently specimens bearing 

 such should be collected as well as others with cauline leaves. For illustrations of the 

 characteristics of the seeds of certain species consult especially Iljin, plate 3 facing 

 page 56 (C. Botrys, urbicum, hybridum, murale, album) and Aellen, Bot. Not. 1928: 

 207 (C. missouriense). 



The distribution of certain species is known only from a few authentic specimens 

 whereas reports of critical groups have been discarded entirely until a more detailed 

 study now in preparation can appear. Future collections will undoubtedly extend the 

 range of most species and add others new to the state. 



