Part 1, 1916) CHENOPODIACEAE 81 
1. Allenrolfea occidentalis (S. Wats.) Kuntze, Rev. Gen. 546. 
1891. 
Arthrocnemum fruticosum Torr. in Stansb. Expl. Utah 394. 1853. Not A. fruticosum Mog. 1840, 
Arthrocnemum macrostachyum Torr. Bot. Mex. Bound. Surv. 184. 1859. “Not A. macrostachyum 
Moris, 1854. 
Halostachys occidentalis S. Wats. Bot. King’s Exp]. 293. 1871. 
Spirostachys occidentalis S. Wats. Proc. Am. Acad. 9: 125. 1874. 
Salicornia occidentalis Greene, Fl. Fran. 173. 1891. 
Plants 3-15 dm. high, suffrutescent below or nearly throughout, more or less glaucous, 
much branched, the branches ascending or spreading, the younger ones 1-3 mm. in diameter, 
the joints 2-10 mm. long; leaves very short, broadly triangular, clasping, acute or acutish, 
soon deciduous or often nearly obsolete; spikes very numerous, 0.6-2.5 em. long, 2.5-4 mm. 
thick, obtuse; calyx closely enclosing the fruit; seed brown or reddish-brown, about 0.6 mm. 
long. 
Tyres Locariry: About Great Salt Lake, Utah. 
DistRisution: In strongly alkaline soil, Oregon to western Texas, Sonora, and Lower California. 
ILLUSTRATIONS: Jepson, Fl. Calif. f. 88; E. & P. Nat. Pfl. 38: f. 36, M-O. 
22. HETEROSTACHYS Ung.-Sternb. Atti Congr. Bot. Firenze 
331. 1876. 
Spirostachys Ung.-Sternb. Vers. Syst. Salicorn. 100. 1866. Not Spivostachys Sonder, 1850. 
Fleshy, erect, much branched shrubs, the branches terete, articulate, subopposite. Teaves 
opposite or subopposite, free, thablades suborbicular, obtuse, usually imbricate on the branchlets. 
Flowers perfect, solitary in the axils of opposite deciduous bracts. Perianth orbicular, mem- 
branaceous, complanate, broadly winged on both sides, 4-lobed, the 2 lateral lobes longer, 
fornicate, carinate, acute, the others plane, obtuse. Stamens 2, lateral. Stigmas 2. Utricle 
oblong-ovoid, compressed, the pericarp membranaceous. Seed inverted, ellipsoid, com- 
pressed, smooth; endosperm copious; embryo semiannular; radicle lateral, ascending. 
Type species, Halocne Ritteri Mog. 
1. Heterostachys Ritteriana (Moq.) Ung.-Sternb. Atti Congr. Bot. 
Firenze 332, 1876. 
Haloc Ritteri Mog. Chenop. Enum. 109. 1840. 
Halostachys Ritteriana Mog. in DC. Prodr. 132: 148. 1849. 
Halocn americ Gillies; Moq. in DC. Prodr. 132: 148, as synonym. 1849. 
Spirostachys Ritteriana Ung.-Sternb. Vers. Syst. Salicorn. 100. 1866. 
Stems suffruticose, erect or ascending, glaucous, the branchlets slender, densely leafy, 
the leaves appressed; spikes sessile or pedunculate, 4-12 mm. long, obtuse; bracts broader 
than long, clasping, very obtuse, concave; seed 0.6 mm. long. 
Tyre LocaLity: Santo Domingo. . 
DISTRIBUTION: Hispaniola; aiso in Argentina. 
IuzustRation: Atti Congr. Bot. Firenze 273. f. 13. 
23. ARTHROCNEMUM Mog. Chenop. Enum. 111. 1840. 
Erect or decumbent, glabrous, fleshy shrubs with opposite articulate branches, the joints 
dilated at the apex into a short sheath. Flowers perfect, free or nearly so, immersed in groups 
of 3 on the opposite sides of the joints, the flowering joints forming cylindric terminal spikes, 
or sometimes only the lower joints of the stems floriferous. Perianth obpyramidal or oval, 
spongious or slightly inflated in fruit, 3- or 4-dentate at the apex, the lateral teeth larger than 
the others. Stamens 2. Ovary oval, somewhat compressed; style elongate; stigmas 2, 
slender. Utricle oval, thin or indurate, included in the perianth. Seed erect, oblong, 
compressed, glabrous; embryo curved, surrounding the copious endosperm; radicle 
inferior. 
Type species, Arthrocnemum fruticosum Moa. 
