糙叶组 cao ye zu

Saxifraga [unranked] Trachyphyllum Gaudin, Fl. Helv. 3: 85. 1828.

Herbs perennial, forming low cushions or sprawling mats, lacking basal bulbils. Leaves alternate; petiole scarcely differentiated; leaf blade leathery, lacking chalk glands and crystals, margin usually entire, occasionally toothed or lobed. Flowering stem leafy; inflorescence cymose. Flowers bisexual, actinomorphic, 5-merous. Petals white to cream, sometimes spotted red or orange, not callose. Filaments subulate to linear; pollen 2-nucleate, exine tectum coarsely striate. Carpels connate for most of placental region, dehiscing distally in fruit; ovary subsuperior. Integuments 2.

About ten species: Asia, Europe, North America, mainly in arctic and montane regions; one species in China.

Lower Taxon

• Saxifraga bronchialis Linnaeus