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4. Catalpa Scopoli, Intr. Hist. Natur. 170. 1777.
梓属 zi shu
Trees deciduous. Leaves simple, purple glandular punctate at vein axils abaxially. Inflorescences paniculate, corymbose, or racemose, terminal. Calyx bilabiate or irregularly divided, globose in buds. Corolla campanulate, bilabiate, upper lip 2-lobed, lower lip 3-lobed. Fertile stamens 2, included, inserted at base of corolla tube; staminodes 3. Disc conspicuous. Ovary 2-locular; ovules several. Capsule dehiscing loculicidally, long terete; valves thin; septum slender, terete. Seeds in several rows, rounded, thin membranous, with hair tufts at both ends.
About 13 species: N America and E Asia; four species in China.
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| 1 |
Inflorescences cymose-paniculate or paniculate; flowers pale yellow or white. |
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(2) |
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Inflorescences corymbose or racemose; flowers pale red or pale purple. |
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(3) |
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| 2 (1) |
Corolla yellow, 2-striate at throat and purple spotted adaxially; leaves broadly ovate, 3-dentate above middle, scabrous on both sides |
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1 Catalpa ovata |
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Corolla yellow-white, pale purple spotted at throat adaxially; leaves ovate-rounded, densely pubescent abaxially |
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2 Catalpa tibetica |
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| 3 (1) |
Leaves triangular-cordate; inflorescences few flowered, lateral branches simple |
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3 Catalpa bungei |
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Leaves ovate; inflorescences many flowered, lateral branches complex |
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4 Catalpa fargesii |
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Lower Taxa
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