Formósuölur
Alnus formosana, eða Formósuölur, er elritegund frá Tævan. Þetta er meðalstórt tré, að 20m hátt. Hann er algeng tegund á árbökkum frá sjávarmáli upp í 2900 m.h.yfir sjávarmáli.

Tilvísanir

Alnus formosana (Burkill) Makino, Bot. Mag. (Tokyo). 26: 390. 1912.
Alnus maritima (Marshall) Nuttall var. Formosan Burkill in FB Forbes and Hemsley, J. Linn. Soc., Bot. 26: 500. 1899; A. japonica (Thunberg) Steudel var. Formosan Callier.
Trees up to 20 m in height; dark gray-brown bark. Purplish brown branches, glabrous, grooved; barely pubescent twigs. Stipitate outbreaks, with 2 scales glabrous vaults. Petiole 1.2-2.2 cm, slender pubescent, densely furrow; Elliptic or oblong-lanceolate Limbo, rarely ovate-oblong, 6-12 × 2–5 cm, abaxially bearded in axils, lateral veins adaxially subglabrous, rounded or broadly cuneate base, irregularly minutely serrated margin, acuminate or acute apex; lateral veins 6 or 7 on each side of the midrib. One female inflorescence, or 2-4 in a cluster, ellipsoid, 1-2.5 cm; peduncle 3–5 mm, robust; bracts 3–4 mm, woody, cuneate base, rounded apex 5-lobed. Nutlet obovate, 2–3 mm, papery wings 1 / 4-1 / 3 as wide as nutlet. Fl. May–June, fr. July–September
 Riverbanks, forming pure, common masses; sea level, about 2,900 m. Taiwan (Tanshui)

Birkiætt
Elri
Niturbindandi tré og runnar