Hackelia davisii Cronquist
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Authority
Gentry, Johnnie L. & Carr, Robert L. 1976. A revision of the genus Hackelia (Boraginaceae) in North America north of Mexico. Mem. New York Bot. Gard. 26: 121-227.
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Family
Boraginaceae
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Scientific Name
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Description
Species Description - Slender perennial, 2-4(-5.5) dm tall; stems several from a slender taproot, ascending, the branched woody caudex tightly clothed with old stem and leaf bases; lower half of stem spreading-hirsutulous (subappressed in some cases), becoming strigose above. Leaves with fine, spreading, puberulent hairs intermingled with coarse subappressed hirsutulous ones, ciliate, dark green; radical leaves few, 5-10 cm long, 5-20 mm wide, elliptic, petiolate up to 1/2 their length; lowermost cauline leaves reduced, narrowly elliptic, early deciduous, becoming broadly lanceolate or ovate at midstem and these often with oblique or cordate base, subclasping, 2-5 cm long, 6-15 mm wide, reducing upwards, lower half of the inflorescence leafy bracteate. Pedicel 8-12(-15) mm long in fruit. Calyx 3 mm long, linear-lanceolate, acute. Corolla limb light blue with a whitish throat, (7-)9-ll mm wide. Fomices with appendages papillate-puberulent, rounded. Anthers 0.8-0.95 mm long. Nutlets 2.5-3 mm long, narrowly ovate; dorsal surface verrucose-hispidulous, the intramarginal prickles minute, 8-16; marginal prickles at the apex of the nutlet distinct, at the base of nutlet nearly so but partially connate to form a very narrow wing; marginal prickles all tending to curve into the dorsal face of the nutlet. Chromosome number, 2n = 48.
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Discussion
Type. IDAHO. Lemhi County: Long Tom Camp, R16E, T23N, near the Salmon River, May 15, 1941, R. J. Davis 3046 (holotype, NY!; isotypes, ID!, WS!). Hackelia davisii is a striking plant that is probably allied to the H. diffusa complex. In many ways it is similar to variety diffusa of the Columbia River gorge but is smaller overall and slender. The cauline leaves tend to be broader, shorter, and subclasping, but in most other characteristics the plant falls within the normal range of variation of H. diffusa var diffusa. Although the plant was not discovered until 1941 we believe this to be mainly because the Salmon River area is relatively inaccessible and therefore poorly collected. When the area becomes more completely botanized, Hackelia davisii may be found to inhabit most of the middle area of the Salmon and associated drainages. It is a plant that is extremely fit, but to an ever decreasing habitat. It is therefore found growing in relatively small, isolated populations.
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Distribution
Habitat and distribution (Fig. 16). Rocky crevices of large boulders and cliffs, rarely in talus, at elevations of 3,500 to 4,000 feet, known only from three localities; two near the mouth of the middle fork of the Salmon River and one on Panther Creek; Idaho and Lemhi Counties, Idaho. Flowers in May and June.
United States of America North America|