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Streptanthus insignis ssp. lyonii is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
[efloras.org] Description, Habitat, Range: Racemes: terminal cluster of sterile flowers pale yellow or purplish. Flowers: sepals of fertile ones greenish yellow or purplish; petals lemon yellow or yellowish white. Fruit valves moderately to densely hispid. 2n = 28.
Flowering Apr-May. Serpentine outcrops in arid grassland, oak woodland; of conservation concern; 200-900 m; Calif.
Subspecies lyonii is known from Merced County.
Kruckeberg and Morrison described subsp. lyonii based on plants with an exclusively greenish yellow terminal cluster of sterile flowers, and discussed a sympatric form with greenish yellow sepals and a purple terminal cluster as a ?bicolor? form. Subsequent collections show that plants with only a greenish yellow terminal sterile cluster are absent in some years, and the ?bicolor? form is here included in subsp. lyonii. (contributed by Mary Ann Machi)
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Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available: