MACLOSKIE I CHENOPODIACE/E. 363 



3. Leaves petiolate, mealy, obtuse. Fruiting bracts round-cordate, 2-crested. patagonica. 

 64. Leaves emarginate, wavy. Fruiting bracts rhomboid, tubercled. undidata. 



A2. Monoecious. Leaves not oblong, except 62. 



b. Leaves spatulate, subsessile. Tall shrubs, lepidote ; male spikes above axillary glomerules. 



patnparum. 

 b2. Leaves oblong-elliptical, short-petioled. Prostrate, branching, grayish. Bracts deltoid, 



connate. reichii. 



3. Leaves ovate to hastate, subentire, sessile upwards ; silvery. Flowers spicate-racemose. 



amegltinai. 

 64. Leaves hastate-deltoid to triangular-oblong, narrower upwards, green. Bracts veiny. 



hortensis. 

 b$. Leaves small, rhombic-ovate, entire, mealy ; petioles twice as long. Glomerules axillary. 



frigida. 

 A$. Dioecious. 



b. Leaves linear-elliptical, cuneate-petiolate, whitish. Fruiting bract triangular-ovate, smooth. 



vulgatissima. 

 62. Leaves small, or suborbicular to elliptical, crowded, sessile or nearly so. Female 



glomerules with protruding styles. Bracts 2-crested. macrostyla. 



b$. Leaves sessile, sagittate with long auricles. Bracts 3 -nerved, not crested, sagittifolia. 



i. ATRIPLEX AMEGHINOI Speg. 



(Obione.] Monoecious, annual? Tall, all silvery-cinereous; leaves 

 rather large, membranaceous, densely and minutely subpellucid-punctate, 

 ovate or hastate, entire or obsoletely repand-subdentate, obtuse, subtripli- 

 nerved ; the lower more or less long-petiolate ; the upper sessile. Flowers 

 long- and interruptedly subspicate-racemose. Thecce of bracts cuneate- 

 ovate or ob triangular, sub truncate, marginally 3~5-dentate, the upper sub- 

 membranaceous and subsessile, the lower coarsely suberose in the disc, 

 and largely 2-crested at the sides, all connate nearly to the apex. 



Not rare in dry salines near Rio Chubut, and along Rio Chico. An 

 erect herb, 25-60 cm. tall. 



2. A. FRIGIDA Speg. 



Monoecious, annual herb, all densely farinose-hoary. Stems a span high 

 with stellately spreading, lax, alternate branches ; the branchlets also pros- 

 trate. Leaves alternate, rather small, broadly ovate or rhomb-ovate, densely 

 hoary-farinose on both surfaces, acute or obtuse, at base rotundate- or 

 cuneate-subtruncate, entire, membranaceous, with petioles twice their 

 length. Flowers glomerulate; glomerules all axillary, subglobose, half 

 as long as the subtending leaf; male flowers minute with yellow exsert 



