sometimes 0. Phyllaries ± 13 or ± 21+, 5–10 (–12) mm, tips green or minutely black. Ray-florets usually ± 8 or ± 13, sometimes ± 21; corolla laminae 10–15 (–20)
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basal laminal cells shorter, broader than medial; medial cells 36–180 × 3–21 µm; apical cells often shorter. Specialized asexual reproduction by 2–7-celled
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panicles or paniculate cymes > 21 20 Inflorescences 1-3(-5)-parted or branched cymes, corymbs, or corymbiform cymes > 25 21 Stems creeping and short-ascending
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nephew of and assistant to Humphrey Marshall Treatment appears in FNA Volume 21. Treatment on page 456. Perennials, (10–) 20–80 (–120) cm (fibrous-rooted
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Zygodon viridissimus Hooker & Taylor Muscol. Brit., 70, plates 3 [upper left], 21 [upper left]. 1818. Dale H. Vitt Etymology: Greek zygon, yoke, alluding to
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ptarmicoides, Solidago riddellii, Solidago rigida (House) Semple & Gandhi Sida 21: 756. 2004. John C. Semple, Rachel E. Cook Basionym: Aster sect. Ptarmicoidei House
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Undefined sect. Baeria Fischer & C. A. Meyer Treatment appears in FNA Volume 21. Treatment on page 338. Mentioned on page 337, 341, 346. Annuals or perennials
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capsule less than 1 mm, if taller then distinctly striate (S. dupretii) > 21 20 Plants small to large, usually forming rounded cushions, tufts, or mats;
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lakes and pools. > 21 20 Plants terrestrial or becoming so, of seasonally saturated soil, temporary streams, vernal pools. > 22 21 Megaspores averaging
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crispate, each margin with 9-15 teeth. > 21 21 Plants 0.2-1.2 m; each blade margin with 9-15 teeth. Berberis amplectens 21 Plants 0.1-0.4 m; each blade margin
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Turesson, G. 1925. Studies in the genus Atriplex. Acta Univ. Lund, n. s. 21: 1–15. Welsh, S. L. 1995. Names and types of perennial Atriplex Linnaeus (Chenopodiaceae)
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and disc (sterile) ovaries in type species Treatment appears in FNA Volume 21. Treatment on page 299. Mentioned on page 255, 300. Perennials, 10–80 cm.
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stipitate-glandular, sometimes glabrous. Receptacles ± flat, pitted, epaleate. Ray-florets 0–21 (usually 5, 8, or 13), pistillate, fertile; corollas violet-purple, purple
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peristome xerocastique, perfect to moderately reduced. Calyptra naked. Spores 9–21 µm. Nearly worldwide Species 15–20 (6 in the flora). Brachytheciastrum was
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1802–1856, early western American explorer Treatment appears in FNA Volume 21. Treatment on page 100. Mentioned on page 65, 66. Perennials, 15–60 (–100)
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spheric or ovoid to short cylindric, 3–20 (–38) × 2–12 cm, glabrous; ribs 13–21, crests deeply notched and usually evidently or prominently divided into tubercles
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4-locular, dehiscence longitudinal; pollen 3-aperturate; pistils simple, 5-21, distinct, closely laterally appressed in 1 series on convex axis, attached
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2011. Guy L. Nesom Illustrated Basionym: Tristemon texanus Scheele Linnaea 21: 586. 1848 (as texanum) Synonyms: Cucurbita pepo subsp. texana (Scheele) Filov
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Treatment appears in FNA Volume 9. Treatment on page 383. Mentioned on page 21, 384. Shrubs or trees; unarmed. Leaves alternate, simple; stipules absent
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secondary and tertiary veins not forming prominent reticulum on adaxial surface. > 21 20 Beak plumose, with spreading hairs; leaf blade finely reticulate (ultimate
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