Abstract

Linanthus bernardinus is described as new from San Bernardino County, California. It is morphologically similar to L. killipii and L. orcuttii subsp. pacificus but differs from plants of these taxa in height, corolla length, seed morphology, and habitat. Linanthus bernardinus can be found growing in vernally moist areas within Joshua tree woodland, often in shallow depressions, or on gentle slopes, in decomposed granite sand that is surrounded by large granite boulder fields.

Highlights

  • The novelty described here was discovered in 2005 when a single specimen that was misidentified as Leptosiphon breviculus (A.Gray) J.M.Porter & L.A.Johnson was found in the RSA herbarium (Fig. 1–4)

  • The specimen was re-identified to the genus Linanthus Benth. (Polemoniaceae), but it could not be satisfactorily identified to species

  • It was morphologically similar to Linanthus killipii H.Mason and L. orcuttii (A.Gray ex Parry) Jeps. subsp. pacificus (Milliken) H.Mason

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Summary

INTRODUCTION

The novelty described here was discovered in 2005 when a single specimen that was misidentified as Leptosiphon breviculus (A.Gray) J.M.Porter & L.A.Johnson was found in the RSA herbarium (Fig. 1–4). The plant differed from plants of both species in height, corolla length, seed color, and the habitat from which it was collected (Table 1). Additional specimens of this taxon were located at RSA and UCR; most of these had been misidentified as L. orcuttii. The genus Linanthus is endemic to North America and contains at least 25 species including the one newly described here (Porter and Johnson 2000). Based on molecular phylogenetic studies, Linanthus as currently circumscribed forms a monophyletic group and includes members of Grant’s sections Linanthus and Dianthoides, along with taxa formerly placed in genus Leptodactylon Hook. & Arn. and several species previously included in Gilia Ruiz & Pav. (Bell and Patterson 2000; Porter and Johnson 2000)

MATERIALS AND METHODS
Nectar guide in the shape of a narrow diamond at the base of each lobe
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