Difference between revisions of "Arabis hirsuta"

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== Distribution ==
 
== Distribution ==
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Circumpolar; in North America, south to California and New Mexico.
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Moist to dry, usually calcareous, open situations:  open woods, stream banks, ledges, cliffs, bluffs, and floodplains. It occurs frequently in disturbed habitats. Dunes and dry banks, rocky/chalk, limestone slopes and gravelly native prairie. Plants seem to be more abundant where grazing is light.
  
 
== Habitat ==
 
== Habitat ==

Revision as of 08:34, 14 May 2012

Common Name Hairy rockcress

Abbreviation Code: ARHI


First overview block: Scientific Name, Synonyms, Family, English Names, Other Names

ARHI RodGilbert flw good.jpg

Taxonomy

  • Kingdom: Plantae
  • (unranked): Angiosperms
  • (unranked): Eudicots
  • (unranked): Rosids
  • Order: Brassicales
  • Family: Brassicaceae
  • Genus: Arabis
  • Species: A. hirsuta

Description

General: Biennial from a simple crown and strong taproot, the 1-several simple stems 1.5-10 dm. tall, pubescent at the base with stiff, simple hairs, becoming glabrous above.

Leaves: Leaves mainly cauline, the basal oblanceolate, 2-8 cm. long, narrowed to short, winged petioles, mostly glabrous on the upper surface, the lower surface purplish, pubescent with stiff, simple hairs; cauline leaves alternate, 5-15, remote to overlapping, sessile and auriculate, ovate-lanceolate to narrowly lance-elliptic, 2-12 cm. long and up to 3 cm. broad, pubescent as the basal leaves or the upper glabrous.

Flowers: Inflorescence of many-flowered, simple to compound racemes; pedicels 6-9 mm. long; sepals 4, 3-5 mm. long, glabrous, the outer 2 gibbous-based; petals 4, white to cream or pinkish, 4-9 mm. long; stamens 6; style 0.5-1 mm. long. Fruit: Siliques glabrous, 3-8 cm. long and 1-2 mm. broad, 1-nerved, strictly erect; seeds in 1 series, 1.5-2 mm. long, wingless or with a wing up to 0.3 mm. broad.

Bloom Period

April - July

Distribution

Circumpolar; in North America, south to California and New Mexico.

Moist to dry, usually calcareous, open situations: open woods, stream banks, ledges, cliffs, bluffs, and floodplains. It occurs frequently in disturbed habitats. Dunes and dry banks, rocky/chalk, limestone slopes and gravelly native prairie. Plants seem to be more abundant where grazing is light.

Habitat

Uses

Propagation

Photo Gallery

References

FloweringTime April - June

Seed

Arabis hirsuta

Seed sample from: 2011

Average Measurement: 1.6 x 0.9 x 0.2

Measurement Range: L: 1.3 - 1.75, W: 0.6 - 1, D: 0.1 - 0.3

Features

Shape: Seeds flat, somewhat winged, especially at hilum end and opposite. Accumbent cotyledons and sulcus present.

Color: Seed dark brown in center, darkening to black at the winged edges. Hilum inconspicuous.

Surface: Texture is bumpy, and seed is somewhat lustrous.

Latitudinal Cross Section: elliptical ARHI-lat-crosssection.png

Longitudinal Cross Section: elliptical ARHI-long-crosssection.png


Basic Explanations and Assumptions:

The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.

Measurements included are the mean average for each measurement of ten separate seeds.

All measurements in millimeters unless otherwise noted.

Photo Gallery

References