Plant Image
Flowers


Yavapai County Native & Naturalized Plants

Athysanus pusillus - common sandweed

Synonyms: Athysanus pusillus var. glabrior, Thysanocarpus pusillus , T. oblongifolious
Other Common Names: dwarf athysanus
Plant Form: Forb or Subshrub

Family: Brassicaceae


   
 
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Leaves
Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Plant
Patrick Alexander @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Forb Plant Description

Origin: Native   Life Cycle: Annual
General Desc: Small annual herb with long, hairy, spindly stems branching from the plant's base where most of the narrow hairy leaves are clustered. Grows both flat on the ground and upright. Many tiny white flowers grow in elongated open clusters at the stem tips.
Identification notes: Diffusely branched from the base, stems slender, forked spreading hairs; leaves primarily basal; fruit of unwinged flat pods bearing hooked hairs that radiate from the margins; fruits do not open to release seeds when mature.
Height: 4 inches to nearly 1 foot


Habitat

Habitat Description: Found in areas of brush and scrub, grasslands, floodplains, woodlands, chaparral, rock outcrops, cliffs and ledges that have dry, sandy and gravelly soils often with layers of limestone, sandstone, granite or volcanic rock like basalt.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Riparian
Elevation: Below 5000 feet


Flower Characteristics

Color: White     Shape: Inconspicuous in elongated clusters     Tubular: N     Flowering Period: Mar - May
Description: The flower stalk has several long, narrow, 1-sided clusters with well-spaced tiny flowers. Flower petals, at times lacking, are white, 1/16 inch long and spoon-shaped; modified leaves (sepals) encasing the flower are about 1/16 inch long and drop early.


Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Smooth     Leaf Attachment: Basal and alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Basal leaves are egg-shaped to oblong about 1/2 inch long with short stalks and coarse, cross-shaped hairs; stem leaves are stemless, fewer and smaller than the basal leaves. Both basal and stemmed leaves may have smooth or few-toothed margins.


Fruit and Seed Characteristics

Fruit Color: Green   
Fruit Type: Capsule
Fruit Notes: Flat, egg-shaped to oblong (silicle) has 1 seed, is 1/16 to almost 1/8 inch wide with soft hairs and prominent veins on its surface; often has 2 types of white hairs along its margin, larger hairs flat and hooked, smaller hairs branched or lacking.
Seed Notes: Seeds are round, flat, light brown, hairless and about 1/16 inch.



  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
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