ROSACEAE Subfam. SPIRAEOIDEAE in Flora of China @ efloras.org

1. ROSACEAE Subfam. SPIRAEOIDEAE

绣线菊亚科 xiu xian ju ya ke

Shrubs, rarely herbs. Leaves alternate, simple, rarely compound; stipules absent or present; leaf blade entire or serrate at margin. Carpels 1–5(–12), free or basally connate, each with 2 to several pendulous, anatropous ovules. Fruit a follicle dehiscing along suture(s), rarely a capsule. x = 8, 9.

About 22 genera and 260 species: widespread in N hemisphere, but mostly absent from arctic regions, extending to S hemisphere in Indonesia (Java and Sumatra) and South America; eight genera and 99 species (67 endemic) in China.

1 Flowers more than 2 cm in diam.; leaves simple; fruit a capsule; seeds winged. 8 Exochorda

+ Flowers less than 2 cm in diam.; leaves simple or pinnate; fruit a follicle; seeds not winged. (2)

2 (1) Carpels 1 or 2; leaves simple; stipules present, caducous. (3)

+ Carpels (1–)5; leaves simple or pinnate; stipules present or absent. (4)

3 (2) Inflorescences racemose or paniculate; hypanthium campanulate to cylindric; follicles usually more than 2-seeded. 6 Neillia

+ Inflorescences corymbose or paniculate; hypanthium cupular; follicles 1- or 2-seeded. 7 Stephanandra

4 (2) Leaves pinnate or 3-foliolate. (5)

+ Leaves simple. (6)

5 (4) Herbs perennial; leaves 1–3-pinnate; stipules absent; carpels 3 or 4(–8), free. 3 Aruncus

+ Shrubs; leaves pinnate; stipules present; carpels 5, connate at base. 4 Sorbaria

6 (4) Stipules present; follicles inflated, dehiscing along both sutures. 5 Physocarpus

+ Stipules absent; follicles not inflated, usually dehiscing along adaxial suture. (7)

7 (6) Leaf blade usually serrate or lobed at margin, rarely entire; inflorescences umbellate, umbellate-racemose, corymbose, or paniculate; carpels free. 1 Spiraea

+ Leaf blade entire at margin; inflorescence a spikelike panicle; carpels connate at base. 2 Sibiraea

Lower Taxa