Juncus effusus L.
Soft rush, common rush
Soft or common rush is native to Eurasia, North America, Australia, and New Zealand. It is at home in acidic, wet soils, such as pond or swamp edges. The attractive-looking clumps are sometimes used in landscaping.
Plants: Soft rush reaches 2–4′ (60–121 cm) in height, growing in clumps (”tussocks”) 2–4′ (60–121 cm) around. Individual stems resemble grass from a distance, but up close, they are smooth and round, filled with a light pith, and soft to the touch. At the base of each stem there is a dark “basal sheath” 2–3″ (5–7.6 cm) long.
Leaves: A reddish or brown sheath at the bottom of each stem.
Flowers: The most notable characteristic is the flower clusters, with 30-100 flowers, which stick out sideways from partway up the stem, looking rather lopsided. Actually, the flowers are at the stem tips, but a bract (specialized leaf) continues upward, looking like a continuation of the stem. Tiny, barely noticeable flowers are yellowish-green to pale brown.
Fruits: Brown oval capsules about 1/16–⅛″ (2–3.5 mm) long, which split open into three parts, releasing tiny seeds about 1/32″ (0.5 mm) in size. Each seed is long, flattened, roughly elliptical, and brown.
Habitats: Wet, acidic soil, such as the edges of ponds.
Online References:
6/8/2012 · Townsend Wildlife Management Area, Townsend, Massachusetts · ≈ 4 × 6″ (10 × 15 cm) 
ID is uncertain 
7/22/2025 · Topsham, Maine · ≈ 4 × 6″ (10 × 15 cm) 
6/20/2012 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 8 × 5″ (19 × 13 cm) ID is uncertain 
7/20/2021 · Otter Brrok Preserve, Harpswell Heritage Land Trust, Harpswell, Maine · ≈ 4½ × 7″ (11 × 17 cm) 
7/20/2021 · Otter Brrok Preserve, Harpswell Heritage Land Trust, Harpswell, Maine · ≈ 4½ × 4″ (12 × 10 cm) 
6/8/2012 · Townsend Wildlife Management Area, Townsend, Massachusetts · ≈ 6 × 9″ (14 × 22 cm) ID is uncertain 
6/29/2014 · Mount Agamenticus, York, Maine · ≈ 6 × 9″ (16 × 23 cm) 
6/22/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 7 × 4½″ (17 × 11 cm) 
6/24/2024 · Otter Brrok Preserve, Harpswell Heritage Land Trust, Harpswell, Maine · ≈ 4 × 6″ (11 × 16 cm) 
6/8/2012 · Townsend Wildlife Management Area, Townsend, Massachusetts · ≈ 3½ × 5″ (9.2 × 13 cm) ID is uncertain 
7/20/2021 · Otter Brrok Preserve, Harpswell Heritage Land Trust, Harpswell, Maine · ≈ 4½ × 4″ (12 × 10 cm) 
6/22/2010 · Nashua River Rail Trail, Ayer, Massachusetts · ≈ 9 × 6″ (22 × 14 cm) 
6/20/2012 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 11 × 7″ (27 × 18 cm) ID is uncertain 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Liliopsida | Monocots (plants with a single seed leaf); includes the lily family |
| Subclass | Commelinidae | Dayflowers and spiderworts, and several others |
| Order | Juncales | Rushes, sedges, and other grasslike plants |
| Family | Juncaceae | Rush family |
| Genus | Juncus | Possibly from Latin jungere, “to join or bind,” because the stems were used for binding |
| Species | effusus | "Loosely spreading, straggling, spread out" (from Stearn's Botanical Latin) |
Juncus effusus description by Thomas H. Kent, not updated.
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