Streptanthus

Streptanthus is a genus of plants within the family Brassicaceae. There are 58 known species within the genus Streptanthus, distributed through the western and south-central United States and northern Mexico. The common names for this genus are twistflower and jewelflower. Twenty-four of the species and eleven lesser taxa occur in California, thirty-two of which are California endemics; seventeen of these California taxa are classified as rare plants.

Species and subspecies
58 species are accepted. The following are some of the species (or subspecies) of the genus Streptanthus (county locations are not intended to be exhaustive):
 * Streptanthus amplexicaulis (S.Watson) Jeps.
 * Streptanthus anceps (Payson) Hoover
 * Streptanthus anomalus D.L.Smith, A.Arthur & R.E.Preston
 * Streptanthus barbatus S.Watson – Pacific jewelflower
 * Streptanthus barbiger Greene – Bearded jewelflower
 * Streptanthus barnebyi (Rollins & P.K.Holmgren) Al-Shehbaz
 * Streptanthus batrachopus J.L.Morrison – Mt. Tamalpais jewelflower
 * Streptanthus bernardinus (Greene) Parish – Laguna Mountain jewelflower
 * Streptanthus brachiatus F.W.Hoffm. – Socrates Mine jewelflower
 * Streptanthus bracteatus A.Gray – Bracted twistflower
 * Streptanthus breweri A.Gray – Brewer's jewelflower
 * Streptanthus californicus (S.Watson) Greene
 * Streptanthus callistus J.L.Morrison – Mt. Hamilton jewelflower
 * Streptanthus campestris S.Watson – Southern jewelflower
 * Streptanthus carinatus C.Wright ex A.Gray – Lyreleaf jewelflower
 * Streptanthus cooperi (S.Watson) Al-Shehbaz
 * Streptanthus cordatus Nutt. – Heartleaf twistflower
 * Streptanthus coulteri (S.Watson) Greene
 * Streptanthus crassicaulis Torr.
 * Streptanthus cutleri Cory – Cutler's jewelflower
 * Streptanthus diversifolius S.Watson – Variableleaf jewelflower
 * Streptanthus drepanoides Kruckeb. & J.L.Morrison – Sicklefruit jewelflower
 * Streptanthus farnsworthianus J.T.Howell – Farnsworth's jewelflower
 * Streptanthus fenestratus (Greene) J.T.Howell – Tehipite Valley jewelflower (Fresno County, California)
 * Streptanthus flavescens Hook.
 * Streptanthus glandulosus Hook. – Bristly jewelflower, common jewelflower (Mendocino County to San Luis Obispo County, California)
 * Streptanthus glandulosus subsp. albidus (Greene) Al-Shehbaz, M.S.Mayer & D.W.Taylor – Metcalf Canyon jewelflower (Santa Clara County, California), endangered
 * Streptanthus glandulosus subsp. arkii M.S.Mayer
 * Streptanthus glandulosus subsp. glandulosus
 * Streptanthus glandulosus var. hoffmanii Kruckeb.
 * Streptanthus glandulosus subsp. josephinensis Al-Shehbaz & M.S.Mayer
 * Streptanthus glandulosus subsp. niger (Greene) Al-Shehbaz, M.S.Mayer & D.W.Taylor – Tiburon jewelflower (Marin County, California), endangered
 * Streptanthus glandulosus subsp. pulchellus (Greene) Kruckeb.
 * Streptanthus glandulosus subsp. raichei M.S.Mayer
 * Streptanthus glandulosus subsp. secundus (Greene) Kruckeb.
 * Streptanthus glandulosus subsp. sonomensis (Kruckeb.) M.S.Mayer & D.W.Taylor
 * Streptanthus glaucus (S.Watson) Jeps.
 * Streptanthus gracilis Eastw. – Alpine jewelflower
 * Streptanthus hallii (Payson) Jeps.
 * Streptanthus hammittii (S.Boyd & T.S.Ross) Al-Shehbaz, Hammitt's clay-cress (Riverside and San Diego counties, California)
 * Streptanthus hesperidis Jeps.
 * Streptanthus heterophyllus Nutt.
 * Streptanthus hispidus A.Gray – Mt. Diablo jewelflower (Contra Costa County, California)
 * Streptanthus howellii S.Watson – Howell's jewelflower
 * Streptanthus hyacinthoides Hook. – Sandhill twistflower (Texas, Arkansas, Louisiana, Oklahoma, Nebraska)
 * Streptanthus inflatus (S.Watson) Greene
 * Streptanthus insignis Jeps. – Plumed jewelflower
 * Streptanthus juneae N.Jensen (San Bernardino Mountains, San Bernardino County, California)
 * Streptanthus lasiophyllus (Hook. & Arn.) Hoover
 * Streptanthus lemmonii S.Watson
 * Streptanthus longirostris (S.Watson) S.Watson – longbeak streptanthella, streptanthella (western US and northwestern Mexico)
 * Streptanthus longisiliquus G.Clifton & R.E.Buck – Longfruit jewelflower
 * Streptanthus maculatus Nutt. – Clasping jewelflower, type species, (Arkansas, Oklahoma, Texas)
 * Streptanthus major (M.E.Jones) Jeps.
 * Streptanthus medeirosii N.Jensen (Tehachapi Mountains, Kern County, California)
 * Streptanthus morrisonii F.W.Hoffm. – Morrison's jewelflower
 * Streptanthus oblanceolatus T.W.Nelson & J.P.Nelson
 * Streptanthus oliganthus Rollins – Masonic Mountain jewelflower
 * Streptanthus petiolaris A.Gray
 * Streptanthus pilosus (S.Watson) Jeps.
 * Streptanthus platycarpus A.Gray
 * Streptanthus polygaloides A.Gray – Milkwort jewelflower
 * Streptanthus purpureus Sánchez Mata, Fuente, Rufo, Nuria Rodr. & Amils
 * Streptanthus simulans (Payson) Jeps.
 * Streptanthus squamiformis Goodman
 * Streptanthus tortuosus Kellogg – Mountain jewelflower, shieldplant
 * Streptanthus vernalis R.O'Donnell & R.W.Dolan – Early jewelflower
 * Streptanthus vimineus (Greene) Al-Shehbaz & D.W.Taylor