17. Mahonia leptodonta Gagnepain, Bull. Soc. Bot. France. 85: 166. 1938.
细齿十大功劳 xi chi shi da gong lao
Berberis leptodonta (Gagnepain) Laferrière.
Shrubs, (0.6-)1-2(-3) m tall. Leaves abaxially yellowish green, adaxially dull green, oblong, 15-18 × 10-14 cm, with 8-12 pairs of contiguous or slightly overlapping leaflets, lowest pair 0.5-1.5 cm above base of petiole, abaxially with raised veins, adaxially with slightly impressed midvein, lateral veins indistinct; rachis 1-2.5 mm in diam.; internodes 1-3(-7) cm, decreasing in length upward; lowest leaflets suborbicular to ovate, 0.7-4 × 0.8-1.5 cm, those above lanceolate to narrowly ovate-oblong, (4.5-)7-10(-14) × 1.5-3 cm, base rounded to subcordate, margin finely 35-65(-130)-spinulose-serrulate on each side, apex caudate-acuminate. Inflorescence 5- or 6-fascicled racemes, 6-7 cm; bracts of inflorescence not seen. Pedicel 5-8 mm; floral bracts oblong, ca. 2 mm. Sepals yellow; outer sepals ovate, ca. 2 mm, apically acute; median sepals oblong, ca. 5 mm; inner sepals oblong, ca. 5 mm. Petals oblong, ca. 3 mm, base without glands, apex rounded, entire. Stamens ca. 2 mm, dilated below anthers; anther connective not prolonged, shortly mucronate. Ovary ca. 1.8 mm; ovules unknown; style absent. Berry unknown. Fl. Aug-Sep, fr. unknown.
● Forests, bamboo thickets, weedy slopes; 200-1500 m. Sichuan, Yunnan.
The combination of very thin leaflets with up to 130 spinulose serrulations on the margins and petals without glands is unique in Mahonia and instantly identifies M. leptodonta.