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| 1 |
Plants dioecious; leaves sessile, mostly opposite [20b.3i. Atriplex subg. Obione subsect. Californicae, for the most part] |
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(2) |
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Plants monoecious; leaves various, but if sessile and mostly opposite, of different distribution |
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(3) |
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| 2 (1) |
Leaves 2-5 mm, subequal to internodes; fruiting bracteoles 2-3 mm; coastal or near coastal s Texas and adjacent Mexico |
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46 Atriplex matamorensis |
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Leaves 8-25 mm, often surpassing internodes; fruiting bracteoles 4-8 mm; coastal Santa Barbara County, California, Baja California, Mexico |
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45 Atriplex watsonii |
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| 3 (1) |
Leaves sessile, blade 5-20 × 1.5-5 mm; fruiting bracteoles 3 mm, rhombic-ovate, acute, sessile, scarcely united, entire; coastal and insular Marin County, California s to Baja California, Mexico [20b.3i. Atriplex subg. Obione subsect. Californicae, in part] |
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44 Atriplex californica |
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Leaves subsessile to long petiolate, blade and fruiting bracteoles mostly more than 3 mm, but if shorter, not from coastal California |
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(4) |
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| 4 (3) |
Fruiting bracteoles (5-)6-12 mm, fibrous and spongy or merely spongy-thickened |
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(5) |
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Fruiting bracteoles mainly 3-6 mm, not fibrous or spongy thickened |
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(7) |
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| 5 (4) |
Fruiting bracteoles obovoid-globular, summit closed by 2 erect, appressed, entire or 3-toothed valves; plants known from cultivation in Wyoming and Texas [20a.4. Atriplex sect. Spongiocarpus, in part] |
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15 Atriplex holocarpa |
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Fruiting bracteoles variously shaped, bearing 1 or 2 appendages; different distributions |
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(6) |
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| 6 (5) |
Fruiting bracteoles 5-7 mm, broadly ovate in profile, entire or dentate, usually with wartlike projections on faces; sea beaches and coastal strand, occasionally inland, from Humboldt County, California, south to Baja Cali- fornia, Mexico [20b.3h. Atriplex sect. Obione subsect. Leucophyllae] |
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43 Atriplex leucophylla |
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Fruiting bracteoles 6-12 mm, broadly turbinate or hemispheric, flattened at summit, bordered by a narrow horizontal wing or acutely angled; plants escaped from cultivation in San Joaquin Valley and San Diego County, California [20a.4. Atriplex sect. Spongiocarpus, in part] |
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16 Atriplex lindleyi |
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| 7 (4) |
Seeds dimorphic: black, 1.5-1.7 mm, or brown, 2 mm; bracteoles fleshy; plants low growing, many stemmed; leaf margin irregularly dentate; introduced, sw British Columbia and Washington, to s California, s Arizona, s Nevada, sw Utah, s Arizona, s New Mexico, and Texas [20a.5. Atriplex sect. Semibaccata, in part] |
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17 Atriplex semibaccata |
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Seeds monomorphic, either black or brown; bracts not fleshy; plants not low growing; leaf margin entire to dentate; various or other distribution |
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(8) |
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| 8 (7) |
Petioles to 1/2 as long as blades, or some blades typically more than 2.5 cm |
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(9) |
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Petioles short (much less than 1/2 as long as blades) or lacking, blades of various lengths |
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(10) |
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| 9 (8) |
Fruiting bracteoles 3 mm and as wide at apex, bluntly deltoid to circular, swollen, hard, smooth, denticulate at apex, faces unappendaged; Australian species [20a.5. Atriplex sect. Semibaccata, in part, Atriplex muelleri Bentham, see |
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17 Atriplex semibaccata] |
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Fruiting bracteoles (3-)5-7 mm, 2-4 mm broad, cuneate-orbicular, margin sharply dentate, faces with appendages or unappendaged; indigenous plants from nc to s California, w and s Nevada, Arizona, New Mexico, w and n Texas, w Oklahoma |
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25 Atriplex argentea (in part) |
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| 10 (8) |
Leaves sinuate-dentate; fruiting bracteoles rhombic, widest and 2- to 4-toothed beyond middle; plants known from s California, e to s Utah [20a.5. Atriplex sect. Semibaccata, in part] |
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18 Atriplex suberecta (in part) |
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Leaves variously toothed or entire; fruiting bracteoles variously shaped and toothed; various or other distribution |
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(11) |
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| 11 (10) |
Fruiting bracteoles 2-4 mm wide, orbicular, subsessile to short stipitate, strongly compressed, united except at thin margin, margin dentate, terminal teeth often prominent, faces smooth; Mojave and Colorado deserts, California and adjacent s Arizona |
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42 Atriplex elegans (in part) |
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Fruiting bracteoles, at least some, more than 4 mm, rhombic or obovate to cuneate-orbiculate, orbiculate, or obovate, margin deeply and acutely dentate, faces variously toothed or appendaged, the terminal teeth not conspicuous; various or other distribution |
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(12) |
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| 12 (11) |
Faces of cuneate-orbiculate fruiting bracteoles with 2 dentate crests or covered with irregular, conic-acute, corky tubercles; sandy seashores, s Carolina to s Florida and w to coastal w Texas |
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37 Atriplex pentandra (in part) |
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Faces of obovate or orbiculate fruiting bracteoles without dentate crests or corky tubercles, usually smooth; saline or alkaline substrates in California, Nevada, Arizona, and Utah |
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(13) |
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| 13 (12) |
Fruiting bracteoles 2-3 mm, obovate, united 1/2 of length, free margin deeply and sharply dentate, faces smooth or sometimes tuberculate; Santa Barbara and Los Angeles to w San Bernardino Counties, California |
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40 Atriplex coulteri |
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Fruiting bracteoles often larger, suborbiculate, or orbiculate, united except at thin margin, margin dentate, terminal teeth often prominent, faces often smooth; interior California, Nevada, Arizona, and Utah |
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(14) |
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| 14 (13) |
Staminate flowers in terminal spikes, pistillate ones in axillary clusters; Sacramento and San Joaquin valleys, California |
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41 Atriplex fruticulosa |
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Staminate flowers in axillary clusters, or staminate and pistillate mixed, usually in axillary clusters; e of Sierra Nevada, in s California, e to Rio Grande Valley of s Texas, and s to Mexico |
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42 Atriplex elegans (in part) |
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