''Montia howellii'' is a species of flowering plant in the family

Montiaceae Montiaceae are a family of flowering plants, comprising about 14 genera with about 230 known species, ranging from small herbaceous plants to shrubs. The family has a cosmopolitan distribution. The family Montiaceae was newly adopted in the APG ...

known by the common names Howell's miner's lettuce and Howell's montia. It is native to western North America from

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

to northern

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, where it grows in moist to wet habitat, including

vernal pool Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals. They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the saf ...

s and meadows. It sometimes grows in shallow standing water such as puddles. The species is known from fossilized seeds recovered from sediments of the Pleistocene Tomales Formation and from a small paleoflora at San Bruno. Further, Daniel Axelrod discussed ''Montia howellii'' as one of the biogeographically significant species comprising the Millerton Palaeoflora at Tomales.Axelrod, D. I. 1983. New Pleistocene Conifer Records, Coastal California. University of California Publications Geological Sciences Volume 127. Berkeley: University of California Press, 31 pp

Description

It is a small, low, mat-forming annual herb growing up to about 9 centimeters in maximum length. The linear or lance-shaped, sometimes grasslike, leaves are alternately arranged and measure up to 2.5 centimeters in length. The

inflorescence In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

bears 2 to 6 minute flowers with oval green

sepal A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106 Etymology The term ''sepalum'' ...

s no more than 2 millimeters long and white petals less than a millimeter in length. The flower is usually

cleistogamous Cleistogamy is a type of automatic self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers. Especially well known in peanuts, peas, and pansies, this behavior is most widespread in the grass family. H ...

, self-fertilizing and sometimes never even opening.

Conservation

This species is believed to be in decline in California, and is ranked as "vulnerable" to extinction overall by

NatureServe NatureServe, Inc. is a non-profit organization based in Arlington County, Virginia, United States, US, that provides proprietary wildlife conservation-related data, tools, and services to private and government clients, partner organizations, and ...

. Threats to the species include grazing,

farming Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...

and

urbanization Urbanization (or urbanisation in British English) is the population shift from Rural area, rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. ...

References

External links

Flora North America TreatmentJepson Manual TreatmentPhoto gallery
howellii Flora of California Flora of the West Coast of the United States Flora without expected TNC conservation status {{Caryophyllales-stub