OF ARTS AND SCIENCES. 103 



petioled ; clusters 1-5 -flowered ; sepal obtuse ; pericarp adherent, 

 minutely tubcrculate ; seed less than ^ line broad, acutish on the 

 margin. — Alkaline valleys of Northwestern Nevada. 



Monolepis pusilla. Torrey ; Watson, in King's Rep. 5. 289. 

 Collectors : — Stretch ; 228 Anderson ; 980 Watson ; Gray. 



12. ATRIPLEX, Tourn. 



Monoecious or dioecious. Staminate flowers bractless, the campanu- 

 late calyx 3-5-cleft or -parted, with as many stamens. Pistillate flowers 

 2-bracted, without calyx * or rarely with 2-4 free hyaline sepals : 

 bracts erect, free or more or less united, becoming enlarged and enclos- 

 ing the fruit ; the margins usually somewhat dilated, toothed or entire, 

 and the sides often thickened and muricate. Styles 2, filiform, free or 

 united at base. Fruit compressed, sessile or stipitate ; the pericarp 

 thin and membranous. Seed vertical, with a thin crustaceous or cori- 

 aceous testa : radicle inferior, ascending, or superior. — Herbs or shrubs, 

 mealy or scurfy-tomentose. Leaves flat, alternate or opposite, often 

 hastate or sinuate-dentate. Flowers usually clustered, axillary, or in 

 simple or panicled spikes, the male and female distinct upon the same 

 or separate plants or mingled in the clusters. 



Sect. I. Annuals : radicle inferior or subascending : bracts free or nearly so. 



§ 1. Bracts ovate-rhombic to triangular or hastate, often appendaged, the 

 margin foliaceous, entire or toothed ; leaves subhastate. 



Spikes naked ; leaves petioled, green 1. A. patiila. 



Spikes mostly leafy ; leaves nearly sessile, gray scurfy. 

 Introduced, rare 2. A. rosea. 



§ 2. Bracts ovate to linear, mostly 4-6 lines long, entire and not margined nor 

 appendaged (except in No. 3), only the apex foliaceous. 



* Leaves alternate. 



Subdioecious ; leaves hastate, subentire ; bracts linear- 

 lanceolate, often toothed at base, 3-nerved, styles 

 included ; calyx 5-cleft. Western Z. A. phyllostegia. 



Androgynous spikes dense, apparently male ; leaves 

 rhombic, sinuate-dentate; bracts ovate-oblong, small; 

 styles exserted ; calyx 4-parted. California ... 4. J., spicata. 



Leaves oblong, entire ; bracts broadly ovate or oblong ; 



radicle nearly superior 5. A. Alaskensis. 



* The Garden Orache, A. hortensis, rarely occurs escaped from cultivation, in 

 which some of the flowers are as in Chenopodium, with a regular 5-lobed calyx 

 2losely covering a liorizontal seed, the remainder having two broad bracts 

 jnclosing a vertical seed, without calyx. 



