Compilation
Styrax youngiae

2 Images see all

Previous
Next

Name

Identification
Styrax platanifolius Not on sheet [family STYRACACEAE ] (stored under name); Verified by Peter Fritsch,, Styrax youngiae Cory [family STYRACACEAE ] Verified by Not on sheet, Styrax youngiae Cory [family STYRACACEAE ] Verified by Not on sheet,
Related name
  • Styrax youngiae
  • Styrax platanifolius
Common name
  • Young’s snowbell, Flora of North America Vol. 8

Flora

Entry for Styrax platanifolius Engelmann ex Torrey subsp. youngiae (Cory) P. W. Fritsch [family STYRACACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 8,
Names
Styrax platanifolius Engelmann ex Torrey subsp. youngiae (Cory) P. W. Fritsch [family STYRACACEAE], Ann. Missouri Bot. Gard., 84: 744. 1998 ,
Styrax youngiae Cory [family STYRACACEAE], Madroño, 7: 113. 1943 (as youngae)
Styrax platanifolius var. youngiae (Cory) B. L. Turner [family STYRACACEAE]
Information
Young twigs densely white stellate-pubescent and with scattered, orange-brown or dark-brown, stalked, stellate hairs proximally. Leaf blades: margins often undulate, entire or coarsely toothed, abaxial surface with white, stellate-lanate pubescence in addition to scattered orange-brown or dark-brown, stalked, stellate hairs of various lengths on some leaves, surface completely covered and obscured by pubescence, adaxial surface with scattered, stellate hairs. Pedicels white stellate-lanate. Flowers: calyx with thick layer of white stellate-lanate hairs, margins and teeth sparsely glandular, teeth to 0.6 mm, usually shorter; style hairy from proximal end to 60–80% of total length.
Conservation Status
of conservation concern
Phenology
Flowering Apr–May; fruiting Jul–Sep
Distribution
elevation unknown [900–2000 m]Mexico (Coahuila).USA Tex.
Discussion
Plants of subsp. youngiae in the Davis Mountains, at the only known locality in the United States (“Limpia; canyon”), have not been rediscovered. The Davis range consists primarily of igneous rocks; V. L. Cory (1943) assumed that the type came from an igneous rather than a limestone substrate. All subsequent collections of subsp. youngiae that document substrate have come from limestone. Limestone does occur sparsely in the Davis Mountains and all other subspecies of Styrax platanifolius apparently grow exclusively on limestone or limestone derivatives; subsp. youngiae may occur only on limestone substrates as well.

Related Materials