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FOC | Family List | FOC Vol. 8 | Saxifragaceae

28. Itea Linnaeus, Sp. Pl. 1: 199. 1753.

鼠刺属 shu ci shu

Jin Shuying ; Hideaki Ohba

Shrubs or trees. Leaves alternate, petiolate; stipules deciduous or evergreen, small, pinnately veined; leaf blade simple, elliptic to lanceolate, secondary veins spreading or curved, margin glandular dentate or spinose dentate, rarely crenate or entire. Inflorescence terminal or axillary, a raceme or racemose panicle, many flowered. Flowers bisexual or also unisexual, small. Calyx tube adnate to base of ovary; lobes 5, persistent. Petals 5, perigynous, erect or reflexed at anthesis, white or yellowish green, valvate. Stamens 5, inserted at margin of disc; filaments filiform-subulate; anthers ovoid to oblong. Disc ringlike. Ovary superior or semi-inferior, attached to disc, 2-carpellate, long ellipsoid; placentation central; ovules numerous, 2-seriate. Style simple or sometimes divided to middle, striate; stigma capitate. Fruit a capsule, conical to linear-oblong, apex cleft, with persistent calyx lobes and petals. Seeds numerous and narrowly fusiform or few and flattened oblong; seed coat glossy; embryo cylindric, large.

About 27 species: mainly in SE Asia and the Himalayas to China and Japan, one species in North America; 15 species (ten endemic) in China.

1 Inflorescences terminal, erect or slightly curved to pendulous; ovary semi-inferior; stamens usually shorter than petals.   (2)
+ Inflorescences axillary, rarely terminal, erect; ovary superior or semi-inferior; stamens usually longer than petals, sometimes shorter.   (5)
2 (1) Petals reflexed at anthesis; inflorescences erect; leaf blade narrowly lanceolate, distal margin 4-8-glandular dentate on both sides, secondary veins in 6-8 pairs   4 I. amoena
+ Petals erect at anthesis; inflorescences erect or slightly curved to pendulous; leaf blade usually elliptic to broadly so, ovate, obovate, or rarely lanceolate or oblanceolate, margin serrate or dentate with more than 10 teeth on both sides, secondary veins in 4-6 pairs.   (3)
3 (2) Leaves often crowded at apex of branchlets, subclustered, leaf blade margin glandular dentate; inflorescences erect; petals triangular-lanceolate   1 I. riparia
+ Leaves remotely alternate on branchlets, leaf blade margin rather curved spinose serrate or crenate-dentate; inflorescences nodding to pendulous; petals linear-lanceolate.   (4)
4 (3) Leaf blade elliptic or ovate, thinly leathery, margin spinose serrate; calyx and pedicels puberulous   2 I. yunnanensis
+ Leaf blade elliptic-oblong or broadly elliptic to orbicular, thickly leathery, margin laxly spinose dentate; calyx and pedicels glabrous   3 I. ilicifolia
5 (1) Ovary semi-inferior; stamens shorter than or subequaling petals.   (6)
+ Ovary superior; stamens longer than petals.   (7)
6 (5) Petals reflexed at anthesis; filaments and ovary glabrous; leaf blade broadly ovate to broadly elliptic, glabrous on both surfaces   5 I. macrophylla
+ Petals erect at anthesis; filaments and ovary puberulous; leaf blade oblong or oblong-elliptic, barbellate at vein axils abaxially   6 I. kiukiangensis
7 (5) Leaf blade thickly leathery.   (8)
+ Leaf blade thinly leathery, papery, or membranous.   (11)
8 (7) Leaf blade glabrous on both surfaces, margin remotely coarsely dentate or subentire   10 I. oldhamii
+ Leaf blade sparsely glandular or sparsely or densely glandular punctate on both surfaces, margin moderately to densely serrate or crenate.   (9)
9 (8) Branchlets, inflorescence rachis, pedicels, and calyx glandular; leaf blade sparsely glandular abaxially   7 I. glutinosa
+ Branchlets glabrous; inflorescence rachis, pedicels, and calyx puberulous; leaf blade glandular punctate on both surfaces.   (10)
10 (9) Leaf blade elliptic or oblong-obovate, ca. 13 × 3-5 cm, apex acute or shortly so; petiole stout, 1.5-2.5 cm   8 I. coriacea
+ Leaf blade oblong or oblong-elliptic, 5.5-7 × 1.7-2.5 cm, apex rounded or obtuse; petiole slender, to 0.7 cm   9 I. yangchunensis
11 (7) Leaf blade papery or membranous, hairy on both surfaces or at least barbellate at vein axils.   (12)
+ Leaf blade thinly leathery, glabrous on both surfaces.   (13)
12 (11) Branchlets usually glabrous; inflorescence rachis and pedicels glabrous; leaf blade lanceolate or oblong-lanceolate, membranous or thinly papery, base cuneate or rarely obtuse, margin ± crenulate-serrate or repand, rarely entire   15 I. parviflora
+ Branchlets densely pubescent; inflorescence rachis and pedicels villous; leaf blade elliptic to oblong-elliptic, papery, base rounded to obtuse, margin serrulate to subentire   14 I. indochinensis
13 (11) Leaf blade narrowly lanceolate, secondary veins in ca. 9 pairs, margin entire proximally, remotely glandular mucronulate in distal 1/3-1/2, apex acuminate, glandular mucronulate; filaments glabrous   11 I. kwangsiensis
+ Leaf blade oblong to ovate-elliptic or obovate, secondary veins in 5-7 pairs, margin proximally shallowly crenate or conspicuously and densely serrulate, distally obscurely crenate-dentate, rarely repand or subentire, apex acute, not mucronulate; filaments pilose.   (14)
14 (13) Leaf blade obovate or ovate-elliptic, secondary veins in 4 or 5 pairs, base cuneate, margin shallowly crenate, rarely subentire; bracts linear-subulate, shorter than pedicels   12 I. chinensis
+ Leaf blade oblong, rarely elliptic, secondary veins in 5-7 pairs, base rounded or obtuse-rounded, margin conspicuously densely serrulate; bracts leaflike, much longer than pedicels   13 I. omeiensis

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