Mentzelia albescens |
Mentzelia procera |
|
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wavy-leaf blazingstar |
upright blazingstar |
|
Habit | Plants biennial, candelabra-form. | Plants biennial, usually candelabra-form, rarely bushlike. |
Stems | solitary, erect, straight; branches distal, distal longest, antrorse, straight; hairy. |
solitary, erect, straight; branches distal or occasionally along entire stem, distal or proximal longest, antrorse, straight or upcurved; hairy. |
Leaves | blade 31–92(–157) × 10.5–27.6(–41) mm, widest intersinus distance 5.2–23.3(–29) mm; proximal lanceolate or elliptic, margins serrate to pinnate, teeth or lobes 8–22, slightly antrorse, 1.8–6 mm; distal lanceolate, base clasping, margins usually serrate to pinnate, occasionally entire, teeth or lobes (0–)10–20, slightly antrorse, 1.4–7.6 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. |
blade 38.3–108 × 5.3–14.9 mm, widest intersinus distance 1.7–3.9 mm; proximal oblanceolate to elliptic, margins pinnate, lobes 14–22(–26), perpendicular to leaf axis, 1.8–4.5 mm; distal elliptic to lanceolate, base not clasping, margins pinnate, lobes 6–18, perpendicular to leaf axis, 1.3–4.5 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. |
Bracts | margins entire. |
margins entire or toothed to pinnate. |
Flowers | petals golden yellow, 5.7–9.2 × 1.3–3 mm, apex usually acute, occasionally rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 4.7–8.4 × 1–2.4 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 3.5–5.4 mm. |
petals light yellow, 9.5–16.8 × 3.4–5.6 mm, apex usually rounded, rarely acute, glabrous abaxially; stamens light yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 8.2–14.6 × 2.3–3.4 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 7.1–12.6 mm. |
Capsules | cylindric, 13.6–23.5 × 5.1–7.8 mm, base tapering, not or slightly longitudinally ridged. |
cup-shaped to cylindric, 9.8–18.8 × 5.2–7.3 mm, base tapering, not longitudinally ridged. |
Seeds | coat anticlinal cell walls straight, papillae 4–17 per cell. |
coat anticlinal cell walls sinuous, papillae 28–68 per cell. |
2n | = 22. |
|
Mentzelia albescens |
Mentzelia procera |
|
Phenology | Flowering May–Nov. | Flowering Jul–Aug. |
Habitat | Dry grasslands, xeric habitats of arroyos, roadsides, roadcuts, washes, chat piles, slopes. | Dry hillsides, roadcuts, roadsides, sandy, clayey, or silty soils. |
Elevation | 200–1600 m. (700–5200 ft.) | 1400–2500 m. (4600–8200 ft.) |
Distribution |
KS; MO; OK; TX; South America (Argentina, Chile) |
AZ; CO; NM; n Mexico |
Discussion | Phylogenetic analyses (J. J. Schenk and L. Hufford 2011) recovered representative populations of Mentzelia albescens from Texas and South America in a monophyletic group. Phylogenetic placement of these populations among lineages in sect. Bartonia, as well as a lack of morphological differentiation among North American and South American populations, suggests a recent dispersal to South America. In the flora area, this species is native to central and western Texas, and introduced in Kansas, Missouri, and Oklahoma. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 12, p. 518. | FNA vol. 12, p. 523. |
Parent taxa | Loasaceae > Mentzelia > sect. Bartonia | Loasaceae > Mentzelia > sect. Bartonia |
Sibling taxa | ||
Synonyms | Bartonia albescens, B. wrightii | Nuttallia procera, M. pumila var. procera |
Name authority | (Gillies ex Arnott) Bentham & Hooker f. ex Grisebach: Abh. Königl. Ges. Wiss. Göttingen 19: 150. (1874) | (Wooton & Standley) J. J. Schenk & L. Hufford: Madroño 57: 247. (2010) |
Web links |