Mentzelia veatchiana |
Mentzelia lindleyi |
|
---|---|---|
Veatch's blazing star, white-stem blazingstar, white-stem stick-leaf |
Lindley's blazing star |
|
Habit | Plants candelabra-form, (5–)20–50 cm. | Plants candelabra-form, 30–70 cm. |
Basal leaves | persisting; petiole present or absent; blade linear-lanceolate, margins deeply to shallowly lobed. |
persisting; petiole present or absent; blade lanceolate to linear, margins usually deeply lobed, lobes rounded. |
Cauline leaves | petiole absent; blade ovate-lanceolate to lanceolate, to 17 cm, margins usually deeply lobed to dentate, rarely entire. |
petiole absent; blade ovate to lanceolate, to 17 cm, margins deeply to shallowly lobed. |
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, ovate to lanceolate, 6.1–14.2 × 3.6–5.1 mm, width 1/3–2/3 length, not concealing capsule, margins 3–7-lobed. |
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. |
sepals 9–19 mm; petals orange proximally, yellow distally, obovate, 20–40 × (12–)16–33 mm, apex mucronate; stamens 20+, 12–30 mm, filaments heteromorphic, 5 outermost linear, inner filiform, unlobed; styles 15–24 mm. |
Capsules | clavate, 8–28 × 2–4 mm, axillary curved to 70° at maturity, usually inconspicuously longitudinally ribbed. |
clavate, 25–40 × 4–5 mm, axillary curved to 90° at maturity, usually inconspicuously longitudinally ribbed. |
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. |
30–40, in 2+ rows distal to mid fruit, tan, dark-mottled or not, irregularly polygonal, surface minutely tessellate under 10x magnification; recurved flap over hilum absent; seed coat cell outer periclinal wall domed, domes on seed edges less than 1/2 as tall as wide at maturity. |
2n | = 54. |
= 36. |
Mentzelia veatchiana |
Mentzelia lindleyi |
|
Phenology | Flowering Mar–Jun. | Flowering May–Jun. |
Habitat | Loamy to sandy soils, grasslands, desert scrub, oak-pine woodlands. | Rocky, open slopes, coastal sage scrub, oak-pine woodlands. |
Elevation | 200–2500 m. [700–8200 ft.] | 90–1400 m. [300–4600 ft.] |
Distribution |
AZ; CA; NV; OR
|
CA
|
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.) |
Naturally occurring populations of Mentzelia lindleyi are limited primarily to the Coast Ranges of the San Francisco Bay area. However, commercial distribution of seeds has resulted in casual alien populations of M. lindleyi throughout the southwestern United States. See 68. M. crocea for discussion of similarities between these species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 543. | FNA vol. 12, p. 538. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | M. albicaulis var. veatchiana | Bartonia aurea |
Name authority | Kellogg: Proc. Calif. Acad. Sci. 2: 99, fig. 28. (1863) | Torrey & A. Gray: Fl. N. Amer. 1: 533. (1840) |
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