San Mateo woolly sunflower
Perennials or subshrubs, 30-60(-90) cm. Stems erect (woolly). Leaves (proximal alternate): blades rhombic to obovate, 2-6 cm, 1-pinnately lobed (lobes 3-5, ± triangular), ultimate margins entire, revolute, abaxial faces loosely woolly, adaxial glabrate (distal leaves gradually reduced in size and lobing). Heads 2-5(-10) in corymbiform arrays. Peduncles mostly 2-7 cm. Involucres broadly campanulate, 5-6(-7) mm diam. Phyllaries 6-10, distinct (ovate, carinate, apices acute). Ray florets (6-)8-10(-13); laminae yellow, 6-10 (× 4.5-5) mm. Disc florets 40-75; corollas 3-4.5 mm. Cypselae 2-3 mm; pappi of 4 cuneate to oblanceolate scales 0.3-1 mm alternating with 4 shorter scales (in disc cypselae, disc pappi longer than ray pappi). 2n = 32. Flowering Apr-Jun. Usually shady sites, oak woodlands; of conservation concern; 100-200 m; Calif. Eriophyllum latilobum combines characteristics of E. confertiflorum var. confertiflorum, with which it sometimes mingles, and E. lanatum var. arachnoideum. It may have originated by hybridization between them (L. Constance 1937; P. A. Munz 1959).