Mentzelia veatchiana |
Mentzelia reflexa |
|
---|---|---|
Veatch's blazing star, white-stem blazingstar, white-stem stick-leaf |
Panamint blazingstar, reflexed blazing star |
|
Habit | Plants candelabra-form, (5–)20–50 cm. | Plants 2–20 cm. |
Basal leaves | persisting; petiole present or absent; blade linear-lanceolate, margins deeply to shallowly lobed. |
petioles present; blade oblanceolate to lanceolate, to 10 cm; margins shallowly lobed, lobes rounded. |
Cauline leaves | petiole absent; blade ovate-lanceolate to lanceolate, to 17 cm, margins usually deeply lobed to dentate, rarely entire. |
petioles usually present, rarely absent; blade broadly ovate to lanceolate, to 10 cm, base not cordate-clasping, margins dentate to serrate. |
Bracts | usually green with prominent white base usually conspicuously extending outwards from midvein, rarely green, usually ovate, rarely lanceolate, 3.3–6.2 × 1.5–3.2 mm, width 1/4–7/8 length, not concealing capsule, margins usually 3–7-lobed, rarely entire. |
green, inconspicuous, not concealing pedicel, ovary, or capsule. |
Flowers | sepals 2–5 mm; petals red to orange proximally, orange to yellow distally, 4–7(–10) mm, apex retuse; stamens 20+, 3–7 mm, filaments monomorphic, filiform, unlobed; styles (3–)3.5–6 mm. |
petals pale yellow to white, lanceolate to oblanceolate, 6–12 mm, apex acute; stamens 3–12 mm (fertile 3–8 mm), 1/2 to ± equal petal length, 1–3(–5) outermost staminodial and petaloid (flowers appearing to have 6–8(–10) petals); filaments heteromorphic, 1–3(–5) outermost oblanceolate, inner linear, all unlobed; style 5–6.5 mm. |
Capsules | clavate, 8–28 × 2–4 mm, axillary curved to 70° at maturity, usually inconspicuously longitudinally ribbed. |
cylindric to ovoid, 9–13 × 5–7 mm, proximal nodding, distal erect. |
Seeds | 15–35, in 2+ rows distal to mid fruit, tan, dark-mottled, usually irregularly polygonal, occasionally triangular prisms proximal to mid fruit, surface tuberculate under 10x magnification; recurved flap over hilum absent; seed coat cell outer periclinal wall domed, domes on seed edges more than or equal to 1/2 as tall as wide at maturity. |
constricted and grooved at middle; seed coat anticlinal cell walls straight, obscure. |
2n | = 54. |
= 20. |
Mentzelia veatchiana |
Mentzelia reflexa |
|
Phenology | Flowering Mar–Jun. | Flowering Mar–May. |
Habitat | Loamy to sandy soils, grasslands, desert scrub, oak-pine woodlands. | Washes, rocky flats, slopes, roadsides, desert scrub. |
Elevation | 200–2500 m. [700–8200 ft.] | 0–1600 m. [0–5200 ft.] |
Distribution |
AZ; CA; NV; OR
|
CA; NV
|
Discussion | Mentzelia veatchiana is the most common and widely distributed hexaploid species in sect. Trachyphytum. It exhibits considerable morphological variation and can be difficult to distinguish from M. montana in northern California. Like the larger-flowered M. pectinata, M. veatchiana has interfertile populations with petal colors ranging from orange to yellow (J. E. Zavortink 1966). When bearing orange petals, M. veatchiana is easily distinguished from other species. Reports of M. veatchiana from Utah are based on specimens treated here as M. montana. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Mentzelia reflexa has been placed in other sections, including Octopetaleia Urban & Gilg (I. Urban and E. Gilg 1900) and Bartonia (J. Darlington 1934), due to the presence of three petaloid staminodes, giving an appearance of eight nearly equal petals (specimens subsequently have been found with as few as one and rarely as many as five staminodes). However, G. S. Daniels (1970) placed it in sect. Bicuspidaria based on characteristics including leaf, capsule, and seed shapes, which are very similar to those of M. tricuspis and M. tridentata. Phylogenetic studies subsequently have supported inclusion of M. reflexa in sect. Bicuspidaria (L. Hufford et al. 2003). Mentzelia reflexa is found in the eastern Mojave Desert. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 543. | FNA vol. 12, p. 525. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | M. albicaulis var. veatchiana | |
Name authority | Kellogg: Proc. Calif. Acad. Sci. 2: 99, fig. 28. (1863) | Coville: Proc. Biol. Soc. Wash. 7: 74. (1892) |
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