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FOC | Family List | FOC Vol. 18 | Scrophulariaceae

3. Paulownia Siebold & Zuccarini, Fl. Jap. 1: 25. 1835.

泡桐属 pao tong shu

Trees, deciduous, evergreen in tropics. Bark smooth with conspicuous lenticels when young, longitudinally splitting with age. Branches opposite, without terminal buds. Leaves opposite, occasionally 3 in a whorl; petiole long; leaf blade entire or shallowly 3-5-lobed, margin undulate and often serrate when young. Inflorescences a large pyramidal to cylindric thyrse. Cymes (1-)3-5(-8)-flowered, pedunculate or not. Calyx campanulate or obconical, hairy; lobes 5, subequal, upper 1 enlarged. Corolla purple or white, funnelform-campanulate to tubular-funnelform; tube base constricted and slightly curved; limb 2-lipped; lower lip elongated and 3-lobed; upper lip yellow, 2-lobed. Stamens 4, didynamous; filaments included, twisted near base; anthers divergent. Ovary 2-loculed. Style nearly as long as stamens. Capsule loculicidal, 2-valved or incompletely 4-valved; pericarp thin or thick and woody. Seeds small, numerous, membranous winged; endosperm sparse.

Seven species: mostly in China with one species extending to Laos and Vietnam; six species in China.

Because of the extensive cultivation of most species, it is often difficult to determine the precise wild distribution.

1 Cymes without a peduncle or peduncle much shorter than pedicels; inflorescences broadly conical, to 1 m; lateral branches of inflorescences more than 1/2 of rachis length.   (2)
+ Cymes with a conspicuous peduncle or peduncle nearly as long as pedicels; inflorescences pyramidal, narrowly conical, or cylindric, to 0.5 m; lateral branches of inflorescences to 1/2 of rachis length.   (4)
2 (1) Cymes peduncle to 6-7 mm, terminal cyme with inconspicuous peduncle; calyx lobed to 1/3-2/5 of its length   7 Paulownia taiwaniana
+ Cymes, except for ones borne on lower branches, without peduncle; calyx lobed to 1/2 or more of its length.   (3)
3 (2) Calyx lobes strongly reflexed in fruit; corolla pale violet to blue-purple, 3-5 cm; young leaves viscid-glandular; capsule ovoid   5 Paulownia kawakamii
+ Calyx lobes adnate to base of fruit; corolla white with purple striae to purple, 5.5-7.5 cm; young leaves stellate tomentose; capsule ellipsoid, or ovoid-ellipsoid   6 Paulownia fargesii
4 (1) Capsule oblong to oblong-ellipsoid, 6-10 cm; pericarp woody, 3-6 mm; inflorescences subcylindric; corolla ventral plaits inconspicuous; calyx 2-2.5 cm   4 Paulownia fortunei
+ Capsule ovoid, ovoid-ellipsoid, or ellipsoid, 3-5.5 cm; pericarp not woody, to 3 mm; inflorescences pyramidal or narrowly conical; corolla ventral plaits conspicuous; calyx to 2 cm.   (5)
5 (4) Capsule viscid-glandular hairy; calyx lobes as long as or longer than tube, not glabrescent   1 Paulownia tomentosa
+ Capsule pubescent when young; calyx lobes shorter than tube, partly glabrescent.   (6)
6 (5) Corolla funnelform-campanulate, apically 4-5 cm in diam.; leaves as long as wide, or slightly longer than wide; capsule ovoid, rarely ovoid-ellipsoid   2 Paulownia elongata
+ Corolla narrowly tubular-funnelform, apically less than 3.5 cm; leaves length ca. 2 X width; capsule ellipsoid   3 Paulownia catalpifolia

Lower Taxa


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