Thysanocarpus laciniatus |
Thysanocarpus laciniatus var. laciniatus |
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mountain fringepod, narrow leaf lacepod |
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Stems | 1–6 dm. |
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Foliage | usually greenish, sometimes purplish basally. |
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Basal leaves | blade oblanceolate to elliptic, 1–6 cm, margins often pinnatifid with narrow lobes (lobes 0.5–1.5 mm), sometimes sinuate-dentate or subentire, surfaces usually glabrous, rarely sparsely hirsute, trichomes whitish, 0.3–0.4 mm. |
blade margins often pinnatifid, sometimes sinuate-dentate. |
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Cauline leaves | blade linear to narrowly elliptic, widest near middle or equally wide throughout, base not auriculate or with small, inconspicuous auricles (not extending around stem). |
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Racemes | internodes (1.5–)2–4.5 mm in fruit. |
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Fruiting pedicels | smoothly recurved or straight and stiffly spreading, (proximal) 3–6(–10) mm. |
usually smoothly recurved, rarely nearly straight. |
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Fruit(s) | flat or plano-convex, obovate to nearly orbicular, (2.5–5 mm wide); valves often glabrous, sometimes pubescent, trichomes clavate, 0.05–0.4 mm; wing entire or deeply crenate, rays absent or indistinct. |
valves usually glabrous, sometimes pubescent, trichomes clavate, 0.2–0.4 mm. |
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Thysanocarpus laciniatus |
Thysanocarpus laciniatus var. laciniatus |
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Phenology | Flowering Mar–May. | |||||||||
Habitat | Chaparral, rocky slopes, canyons, oak woodlands, washes | |||||||||
Elevation | 200-1800 m (700-5900 ft) | |||||||||
Distribution |
AZ; CA; nw Mexico
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AZ; CA; Mexico (Baja California) |
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Discussion | Varieties 3 (3 in the flora). Thysanocarpus laciniatus presents some of the same problems as does T. curvipes. Variety laciniatus contains both diploids and tetraploids (M. D. Windham, unpubl.) and varies in fruit characters, pubescence, and basal leaf shape. Specimens with sinuate-dentate basal leaf margins and small auricles on cauline leaves can be difficult to distinguish from T. curvipes. Preliminary molecular phylogenetic analyses support the distinction between T. curvipes and T. laciniatus var. laciniatus, but suggest that tetraploid populations of the latter may have arisen through hybridization between T. curvipes and a diploid member of the T. laciniatus clade (P. Alexander, unpubl.). Varieties hitchcockii and rigidus are distinctive diploids (Windham, unpubl.) with restricted ranges and may deserve specific rank. Variety rigidus (known to us from only four collections) can be difficult to distinguish from the more purplish specimens of var. laciniatus, but the latter have at least some recurved pedicels and often have pinnatifid leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety laciniatus is found in Arizona on the extreme western side of the state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 7, p. 740. | FNA vol. 7, p. 741. | ||||||||
Parent taxa | Brassicaceae > tribe Thelypodieae > Thysanocarpus | Brassicaceae > tribe Thelypodieae > Thysanocarpus > Thysanocarpus laciniatus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | T. affinis, T. laciniatus var. affinis, T. laciniatus subsp. desertorum, T. laciniatus var. eremicola, T. laciniatus var. ramosus, T. ramosus | |||||||||
Name authority | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 118. (1838) | unknown | ||||||||
Web links |