WorldFloraDB - Torreya

Characteristics

Trees evergreen, dioecious (occasionally monoecious); branches whorled; branchlets subopposite or subwhorled, base with bud scales not persistent; winter buds with several pairs of decussate bud scales. Leaves decussate or subopposite, 2-ranked, linear or linear-lanceolate, basally twisted, leathery, adaxial surface slightly convex with midvein ± indistinct, abaxial surface with 2 stomatal bands, resin canal present on abaxial side of vascular bundle, base decurrent, apex sharply acuminate. Pollen cones axillary, solitary, shortly pedunculate, ellipsoid or shortly columnar; microsporophylls in 4-8 whorls each of 4 microsporophylls; pollen sacs (3 or)4, marginal, pendulous. Seed-bearing structures borne in pairs in leaf axils, sessile, each with 2 pairs of decussate bracts and 1 lateral bract; ovule 1, erect. Aril succulent, base of aril with persistent bracts. Seed ripening in autumn of 2nd year, drupelike, completely enclosed within aril; female gametophyte tissue ruminate or not. Cotyledons 2. Germination hypogeal. 2n = 22.

More

Trees dioecious. Bark brown to grayish brown, tinged with orange, fissured. Branches spreading to drooping; twigs nearly opposite. Leaves mostly appearing 2-ranked, rigid; stomates abaxial, in 2 narrow, glaucous, whitish or brownish bands; apex sharp-pointed, spine-tipped, sharp to touch; resin canal central. Pollen cones ovoid or oblong, with 6--8 whorls of 4 sporophylls, each bearing 4 sporangia. Ovules 2, only 1 of each pair maturing. Seed maturing in 2 years; aril green or green with purple streaks, resinous, leathery, thin, completely enclosing woody seed coat, splitting into 2 parts at maturity; albumen ruminate. x = 11.

Life form	annual
Growth form	tree
Growth support	-
Foliage retention	evergreen
Sexuality	dioecy
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Environment

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Hardiness (USDA)

Usage

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Cultivation

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