Buddleja corrugata M.E.Jones
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Authority
Norman, E. M. 2000. Buddlejaceae. Fl. Neotrop. Monogr. 81: 1-225. (Published by NYBG Press)
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Family
Buddlejaceae
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Scientific Name
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Type
Type. Mexico. Baja California Sur: Arroyo Hondo (Undo) Ranch, Loreto, Sierra Giganta, Jones 27361 (holotype, POM; isotype, GH).
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Description
Species Description - Dioecious much-branched shrub 0.1-1 m tall, with grayish to blackish rimose bark, with persisting old naked twigs, young branches terete, tomentose. Leaves with petiole 0.2-1 cm long, stipular lines inconspicuous, blades ovate, ovate-oblong, or linear, 1-4 x 0.2-3 cm, membranaceous to subcoriaceous, tomentose on both surfaces, underlain by glandular trichomes, sometimes glabrescent above; apex acute or obtuse, base cuneate, attenuate, somewhat decurrent, margin sinuate, dentate, crenate, or somewhat involute. Inflorescence with 3-8(-15) pairs of sessile or short pendunculate heads appearing as verticels, substended by short bracts, each verticel with 6-20 flowers, 0.5-1 cm diam. Calyx tubular or campanulate, tomentose outside, sometimes glandular inside, tube 1.5-2.5 mm long, lobes acute or acuminate 0.7-1.4 mm long. Corolla yellow to orange, campanulate to salverform, outside tomentose on upper half of tube and base of lobes, with scattered warty hairs primarily below stamens, often glandular trichomes in rows above stamens, tube 2-4(-5) mm long, lobes orbicular, 1-1.5 x 1.2-2 mm. Stamens subsessile, inserted in upper third of tube, anthers 0.5-0.7 mm long. Capsule ovoid, 2-3 x 1.5-2 mm, tomentulose in upper half, dehiscing septicidally and loculicidally, valves usually separating. Seeds type 5, ovoid 0.4-0.5 x 0.2-0.28 mm, wingless, seed body filling the testa.
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Discussion
Buddleja corrugata is closely related to both B. utahensis of the Mojave Desert and to B. marrubiifolia of the Chihuahuan Desert. Judging from the discovery of B. corrugata subsp. moranii in central Sonora, it might be suggested that this subspecies once had a larger distribution than at present, and that a northern extension in the Sonoran Desert might have evolved into B. utahensis, when drought spread, perhaps in Middle Pliocene (Axelrod, 1948). Buddleja marrubiifolia is morphologically very close to Buddleja corrugata subsp. corrugata, differing primarily in its single terminal head and larger seeds. These characters are most likely derived traits in this series and suggest that B. marrubiifolia was derived from a B. corrugata ancestor.
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Distribution
In Baja California Sur, Monserrate Island in the Gulf of California, and in a few locations in Chihuahua and Sonora, Mexico; growing on limestone at 200-1900 m. Flowering primarily from February to June. This species is not mentioned in Shreve & Wiggins, 1964, nor in Wiggins, 1980.
Mexico North America|