栎叶亚菊 li ye ya ju

Tanacetum quercifolium W. W. Smith, Notes Roy. Bot. Gard. Edinburgh 8: 119. 1913; Chrysanthemum quercifolium (W. W. Smith) Handel-Mazzetti; Dendranthema quercifolium (W. W. Smith) Kitamura; Phaeostigma quercifolium (W. W. Smith) Muldashev.

Subshrubs, 60-150 cm tall. Old branches gray-black; flowering branches robust, white, powdery-sericeous especially in upper part and on peduncles. Middle leaves of flowering branches shortly petiolate; leaf blade narrowly elliptic, lanceolate, or obovate-oblong, rarely linear, 5-10 × 2-4 cm, rigid, abaxially white or gray-white, densely and thickly sericeous, adaxially green, glabrous, margin coarsely dentate, incised-lobed, or -fid, teeth or lobes 3- or 4-paired, obliquely triangular or lanceolate, sometimes middle and distal leaves of flowering branches linear-lanceolate or broadly linear, to 10 cm, margin entire. Upper leaves progressively smaller. Synflorescence a dense flat-topped panicle, 4-9 cm in diam.; peduncle robust. Capitula many. Involucres campanulate, 5-6 mm in diam.; phyllaries in 4 rows, scarious margin yellow-brown, outer ones ovate-lanceolate, ca. 2 mm, abaxially sparsely sericeous, middle and inner ones narrowly elliptic to lanceolate, 3-4 mm, abaxially glabrous. Florets yellow, with sessile glands; marginal female florets 11, corolla narrowly tubular, apex minutely 4-denticulate; disk florets many, corolla tubular, apex 5-lobed. Achenes ca. 1.5 mm. Pappus absent. Fl. and fr. Aug-Oct.

● Forest understories, thickets; 3200-3900 m. Sichuan, Yunnan.