Flora of the Hawaiian Islands
Dicotyledon Literature for Trifolium dubium
Wagner et al., 1990, 1999.
   Fabaceae -- The Pea Family Bibliography
      Trifolium dubium

Common name(s): clover, trefoil, small hop-clover
General Information
DistributionNative to Europe, widely naturalized.In the Hawaiian Islands, naturalized on Kaua`i, Maui, Hawai`i.

Fabaceae - Trifolium dubium Fabaceae - Trifolium dubium

Annual herbs; stems erect to decumbent, 0.5-3.5 dm long, many-branched, appressed pubescent or glabrate.
Leaflets obovate, 5-12 mm long, 3-7 mm wide, lower surface with scattered long hairs, especially along midrib, margins denticulate in upper part, petiolule of terminal leaflet longer than those of lateral leaflets, stipules ovate, adnate to petioles in lower part.
Heads axillary, globose, 5-8 mm in diameter, peduncles 5-15(-20) mm long, pedicels ca. 2 mm long, bracts absent; calyx tube 0.8-1.2 mm long, 5-nerved, glabrous, upper 2 teeth 0.2-0.5 mm long, lower ones 0.8-1.2 mm long; corolla yellow, 2.5-3.5 mm long, becoming yellowish brown and persistent in fruit.
Pods oblong, enclosed in the calyx.
Seed 1-1.3 mm long.
2n = 16, 28, 32