Chloropyron palmatum (formerly Cordylanthus palmatus) is an endangered species of salt-tolerant, flowering plant in the family Orobanchaceae.

[5][6] Ferris had already mentioned that her usage of the respected English taxonomist George Bentham's junior synonym Adenostegia may have been incorrect.

In three different 1891 publications three different botanical taxonomists, the American Edward Lee Greene, the Austrian Richard Wettstein and the German Otto Kuntze, had all pointed out that Bentham's name had priority, and as such Ferris classified the new taxon in Adenostegia,[6] but nonetheless James Francis Macbride moved the species to the genus Cordylanthus the following year.

[7] In 1947 the Scrophulariaceae expert (these plants were classified in that botanical family at the time) Francis W. Pennell described a neighbouring population as the new species C.

[14] The plant is endemic to the Central Valley of California, where it has been recorded in the counties of Colusa, Yolo, Alameda, San Joaquin, Madera and Fresno.

[16] The California Native Plant Society, on the other hand, records 14 locations: Kerman*, Tranquillity, Firebaugh*, Poso Farm, Altamont, Livermore, Stockton West*, Grays Bend, Grimes*, Colusa, Arbuckle, Logandale, Maxwell and Moulton Weir.

[17] The plant is limited to seasonally-flooded flats with saline and alkaline soils, where it grows with other halophytes such as iodine bush (Allenrolfea occidentalis) and alkali heath (Frankenia salina).

[13] The main threat to its existence is the destruction of its already naturally limited habitat, for agriculture and development uses, with other adverse effects from alteration in hydrology, off-road vehicles, and grazing of livestock.