Mucronea californica

Vulnerable  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Mucronea
Species:
M. californica
Binomial name
Mucronea californica
Synonyms[2]
  • Chorizanthe californica (Benth.) A.Gray
  • Chorizanthe californica var. suksdorfii J.F.Macbr.
  • Mucronea californica var. suksdorfii (J.F.Macbr.) Goodman

Mucronea californica is a rare species of annual plant in the family Polygonaceae known by the common names California spineflower or California mucronea. An ephemeral plant found growing in the sandy microhabitats of coastal sage scrub, chaparral and dunes, this plant is threatened by the urbanization and development of its viable habitat and has been locally extirpated over much of its range. It has small, white to pink flowers that top inflorescences spined with awns.[3]

Description

An ephemeral annual plant, this species grows narrow leaves from a rosette, and develops a spiny, awn-covered inflorescence with white to pink flowers on the top.

Morphology

The inflorescence with flowers

This species grows 5 to 30 cm (2.0 to 11.8 in) by 10 to 60 cm (3.9 to 23.6 in) in diameter. The leaves form a basal rosette, attached to the plant via a petiole 0.5 to 3 cm (0.20 to 1.18 in) long. The leaves are shaped narrowly spatulate to obovate, measuring 1 to 5 cm (0.39 to 1.97 in) long by 2 to 8 mm (0.079 to 0.315 in).[3][4]

The inflorescence is cyme-like. There are 3 bracts, which are spreading to nearly erect, and are connate for half of their length, shaped triangular to ovate or oblong. The bracts become acerose at the terminal nodes, and then linear to linear-lanceolate, 0.5 to 1 cm (0.20 to 0.39 in) long, with the apex acute to obtuse. The inflorescence is covered in awns, which are 1 to 2.5 mm (0.039 to 0.098 in) long.[3][4]

The involucres are 3-angled and obscurely ribbed, with 3 teeth. Their surface is glandular to slightly hirsute, with awns 1 to 2.5 mm (0.039 to 0.098 in) long. Flowering is from March to August. The singular flowers have a perianth 1.5 to 2.5 mm (0.059 to 0.098 in) large, pubescent near the base on the lower surface. The tepals are oblong, with an entire apex. There are 6 to 9 stamens. The fruits are achenes 2 to 3 mm (0.079 to 0.118 in).[3][4]

Distribution and habitat

This species is endemic to California, and is found mostly on the Pacific Coast ranging from San Luis Obispo south to San Diego County, along with a number of locations inland from Monterey County to western Riverside County. It is found along sandy openings in a variety of habitats, from coastal sage scrub, chaparral communities, and dunes to sandy substrates in grasslands and pine-oak woodlands. It is threatened and in substantial decline from the extensive urbanization in southern California, which has made it locally extirpated over much of its historical range.[4][1]

References

  1. 1 2 "Mucronea californica". NatureServe Explorer. Arlington, Virginia: NatureServe. 2022. Retrieved 12 March 2022.
  2. ↑ "Mucronea californica". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 12 March 2022.
  3. 1 2 3 4 Reveal, James L.; Rosatti, Thomas J. (2012). "Mucronea californica". Jepson eFlora. Jepson Flora Project. Retrieved 12 March 2022.
  4. 1 2 3 4 Reveal, James L. "Mucronea californica". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). New York and Oxford: Oxford University Press. Retrieved 12 March 2022 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
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