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D. stewartii resources
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Dryopteris stewartii Fraser-Jenk.
Etymology Stewartii is named for John Stuart, Earl of Bute (1713-1792)
Description Rhizome: erect, branching.
Frond: 100 cm high by 35 cm wide, deciduous, monomorphic, blade/stipe ratio: 2:1 to 3:1.
Stipe: grooved, scales dark brown, vascular bundles: 3-7 in a c-shaped pattern.
Blade: 2-pinnate, lanceolate, herbaceous to somewhat leathery, linear to ovate scales below, absent above.
Pinnae: 20 to 22 pair, subopposite, lowest pinnae anadromic; pinnules slightly pinnatifid at the base, the first lower pinnule of the lowest pinnae slightly longer than the upper pinnule, basal pinnules stalked; costae grooved above, continuous from rachis to costae; margins spiny; veins free, forked.
Sori: round, 1-2 mm, medial, on both sides of the costule, indusium: reniform, tan, at a sinus, sporangia: brown to black, maturity: late spring to summer.
Culture Habitat: in forests at mid to high elevations. Distribution: Himalayas: Afghanistan, Pakistan, India, Nepal. Hardy to -20C, USDA Zone 6.
Dryopteris odontoloma f. brevifolia Mehra & Khullar
Dryopteris stewartii
Dryopteris stewartii.  Illustration from The Cultivated Species of the Fern Genus Dryopteris in the United States, Barbara Joe Hoshizaki and Kenneth A. Wilson, American Fern Journal, 89, 1, (1999), with permission.
Dryopteris stewartii
Dryopteris stewartii. Pinnules, 15 June, the first maturing fronds. Click for the entire pinna.  Scan: Tom Stuart
Dryopteris stewartii
Dryopteris stewartii. Habit: spreading, lowest pinnae bending forward above the plane of the frond.  Photo: Tom Stuart
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