406 CHENOPODIACE.E. (GOOSEFOOT FAMILY.) 



* Embryo coiled into a ring around copious central albumen. Leaves flat, not spiny nor fleshy. 



-♦- Flowers all alike and perfect, or merely polygamous by the want of stamens in some of them, 

 clustered or panicled. Calyx obvious. Seed-coat crustaceous. 



1. Cycloloma. Calyx 5-cleft, in fruit surrounded by a horizontal continuous membrana» 



ceous wing. Seed horizontal. 



2. Clieiiopotliiim. Calyx 3 - 5-cleft or parted, the lobes naked or merely keeled in fruit. 



Seed horizontal, rarely vertical. 



3. Blitum. Calyx of 3-5 sepals, mostly juicy or fleshy in fruit. Seed vertical. 



— -t- Flowers monoecious or dioecious, and of 2 distiuct sorts ; the staminate with a regular 

 calyx, clustered, ihe clusters mostly spiked. 



4. A triplex. Fertile flowers without calyx, enclosed between a pair of appressed bracts. 



._ h- *- Flowers all perfect and alike, single in the axil of bracts, naked or 1-sepalled. 



5. Corispermum. Fruit oval, flattened : pericarp adherent to the seed. Leaves linear. 



* # Embryo narrowly horseshoe-shaped or conduplicate -. no albumen. Stem fleshy, jointed : 



leaves reduced to opposite fleshy scales or teeth. Flowers densely spiked, perfect. 



6. Saliconiia* Flowers sunk in hollows of the axis of the fleshy spike. Calyx utricle-like. 



* * # Embryo coiled into a spiral : albumen mostly none. (Leaves alternate.) 



7. Suseda. Embryo flat-spiral. Calyx wingless. Leaves succulent. 



8. Salsola. Embryo conical -spiral. Calyx in fruit horizontally winged. Leaves spineseent 



1. CYCLOLOMA, Moquin. Winged Pigweed. 



Flowers perfect, bractless. Calyx 5-cleft, with the concave lobes strongly- 

 keeled, enclosing the depressed fruit, at length appendaged with a broad and 

 continuous horizontal scarious wing. Stamens 5. Styles 3. Seed horizontal, 

 flat. Embryo .encircling the mealy albumen. — An annual and much-branched 

 coarse herb, with alternate sinuate-toothed petioled leaves, and small panicled 

 clusters of sessile flowers. (Name composed of kvkXco, round about, and Xco/za, 

 a border, from the encircling wing of the calyx in fruit.) 



1. C. platyphyllum, Moquin. (Salsola platyphylla, Michx.) — Illinois, 

 on sandy banks of the Mississippi, and northwestward. 



2. CHENOPODIUM, L. Goosefoot. Pigweed. 



Flowers perfect, all bractless. Calyx 5-cleft, rarely 2-4-cleft or parted, with 

 the lobes sometimes keeled, but not appendaged nor becoming succulent, more 

 or less enveloping the depressed fruit, Stamens mostly 5 : filaments filiform. 

 Styles 2, rarely 3. Seed horizontal (sometimes vertical in Nos. 3, 7 -9), lenticu- 

 lar ; the coat crnstaceous : embryo coiled partly or fully round the mealy albumen. 

 — Weeds, usually with a white mealiness, or glandular. Flowers sessile in 

 small clusters collected in spiked panicles. (Named from xh v -> a g°ose, and ttovs, 

 foot, in allusion to the shape of the leaves.) — Our species are all annuals (ex- 

 cept the last two), flowering through late summer and autumn, growing around 

 dwellings, in manured soil, cultivated grounds, and waste places. 



§ 1 . Smooth or mealy, never glandular nor sweet-scented : embryo a complete ring. 



1. C. poltspermum, L. Low, often spreading, green and wholly destitute of 

 mealiness throughout : leaves all entire, oblong or ovate and on slender petioles ; 

 flowers very small, the thin lobes of the calyx very incompletely enclosing the 

 fruit; seed obtuse-edged. — In and around Boston : scarce. (Adv. from Eu.) 



