Streptanthus anomalus is an annual plant with a simple or branched, erect stem, growing 15 to 40cm (6 to 16in) tall. Basal rosette leaves are 3 to 5cm (1.2 to 2.0in) long, oblanceolate, dentate, with ciliate margins, while ovate cauline leaves have distinctive clasping bases. By flowering time, most rosette and proximal leaves are absent, and distal leaves have faded to a greenish yellow. Flowers occur in bracted, one-sided racemes, with 2–3mm (0.08–0.12in)pedicels. The calyx is urn shaped, and the sepals are either greenish-yellow or dark wine-red. 7–9mm (0.28–0.35in) long petals are exserted from the calyx, with yellow bases, brown to purple blades, and white margins. Stamens occur in either 3 unequal pairs, or with 4 long and 2 short stamens. The upper stamens have fused filaments and sterile anthers. Fruits are siliques, 4–7cm (1+9⁄16–2+3⁄4in) long and 3–4mm (0.12–0.16in) wide, with 30-40 seeds. Each seed is 2mm (0.08in) long and 1.75mm (0.07in) wide, with a narrow wing.[2][3]
Range
Streptanthus anomalus is restricted to 3 occurrences on the lower slopes of Mount Burdell, north of the City of Novato in Marin County, California. These occurrences were discovered in 2011, 2012, and 2023.[4]
Habitat
Streptanthus anomalus is endemic to serpentine soils, where it occurs in sparsely vegetated grasslands with thin, rocky soils.[2]
Etymology
The specific epithet "anomalus" alludes to the anomalous possession of bracted inflorescences, which are absent among other members of section Euclisia. "Mount Burdell" refers to the range of the species,[2] while "Tcukamos" is the Coast Miwok name for that geographic feature.[5]
Taxonomy
Streptanthus anomalus was described in 2019. It has been placed in section Euclisia alongside S. glandulosus. It does, however, share some characteristics with S. tortuosus, which suggests a possible hybrid origin.[2]
Conservation
Streptanthus anomalus has been assigned a California Rare Plant Rank of 1B.1 indicating that the species is rare, threatened, or endangered throughout its range.[6]
It has also been assigned a NatureServe status of G1S1, indicating that the species is critically imperiled.[7]
This article needs additional or more specific categories. Please help out by adding categories to it so that it can be listed with similar articles.(January 2025)
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
