Howellanthus (Constance) Walden and R. Patt. is recognized as a new genus, containing a single species H. dalesianus (J. T. Howell) Walden and R. Patt., based on morphological evidence. Howellanthus dalesianus (Boraginaceae) is a small perennial herb, endemic to northern California and restricted to ultramafic soils. The species was first collected in 1936 by Ella Dales Cantelow and Herbert Clair Cantelow, described by John Thomas Howell as Phacelia dalesiana J. T. Howell, and later placed in the monotypic Phacelia subg. Howellanthus by Lincoln Constance.
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Madroño
Vol. 57 • No. 4
October 2010
Vol. 57 • No. 4
October 2010
Boraginaceae
Howellanthus
Hydrophyllaceae
Hydrophylloideae
phacelia
Phacelieae
serpentine