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Montana Field Guide

Montana Field Guides

Annual Knawel - Scleranthus annuus
Other Names:  German Knotweed

Non-native Species

Global Rank: GNR
State Rank: SNA
C-value: 1


Agency Status
USFWS:
USFS:
BLM:


 

External Links






 
General Description
Puberulent annual. Stems to 15 cm, ascending to erect, branched below. Leaves linear, pungent, 5–10 mm long, the scarious bases united around the stem. Inflorescence terminal and axillary, congested cymes. Flowers: sepals leathery, 2–4 mm long, united below into a short 10-veined tube with lanceolate lobes; petals absent; stamens 5 to 10; styles 2, exserted from the tube. Fruit a utricle enclosed in the hardened calyx (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Non-native
 


Range Comments
Throughout eastern U.S., Pacific Northwest to CA. Introduced from Europe (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 20

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Roadsides, streambanks; disturbed grasslands; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Management

References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Annual Knawel"
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Citation for data on this website:
Annual Knawel — Scleranthus annuus.  Montana Field Guide.  .  Retrieved on , from