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Montana Field Guide

Montana Field Guides

Annual Knawel - Scleranthus annuus

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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

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

References
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Citation for data on this website:
Annual Knawel — Scleranthus annuus.  Montana Field Guide.  .  Retrieved on , from