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marsh arrow-grass, marsh arrrow-grass, troscart des marais

arrow-grass, troscart

Habit Plants with fibrous strands of leaves at base, 9–42.5 cm. Herbs, perennial.
Roots

occasionally with tubers.

Rhizomes

stout.

Leaves

erect from sheath, shorter than scapes, 6–24.5 cm;

sheath 3.5–5 cm × 1.5–5 mm, ligule not hoodlike, unlobed;

blade 0.8–2.9 mm wide, apex acute.

erect, terete;

sheath with ligule apically entire or 2-lobed.

Inflorescences

scape often purple near base, mostly exceeding leaves, 5.5–27.2 cm × 1–2.1 mm;

racemes 5.1–21.4 cm × 2–5 mm;

pedicel 0.4–4.5 × 0.1–0.5 mm.

spikelike racemes, scapose;

scapes shorter than to longer than leaves.

Flowers

tepals elliptic, 1.1–1.6 × 0.7–0.9 mm, apex round;

pistils 6, 3 fertile, 3 sterile.

bisexual, of 1 type, short-pedicellate;

tepals 6, in 2 series, distinct, yellow-green, conchiform;

stamens 4 or 6;

anthers nearly sessile;

pistils 6, 3 fertile, 3 sterile or 6 fertile, separating when mature;

ovules 1 per locule;

styles absent.

Fruits

fruiting receptacles with wings;

schizocarps linear, 7–8.3 × 0.8–1.2 mm;

mericarps linear, weakly ridged abaxially, 6.5–8.5 × 0.5–1.5 mm, beak erect, 0.3 mm.

schizocarps, globose to linear in fruit;

mericarps 3 or 6.

x

= 6.

2n

= 24.

Triglochin palustris

Triglochin

Phenology Flowering summer and early fall.
Habitat Coastal and mountain marsh areas and moist alkaline meadows
Elevation 0–3700 m (0–12100 ft)
Distribution
from FNA
AK; AZ; CA; CO; IA; ID; IL; IN; ME; MI; MN; MT; ND; NE; NH; NM; NV; NY; OH; OR; PA; RI; SD; UT; WA; WI; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Mexico; South America; Greenland; Eurasia
[WildflowerSearch map]
[BONAP county map]
from USDA
Nearly all temperate areas; reaching tropics; especially in higher elevations
[BONAP county map]
Discussion

The fruit type of Triglochin has been variously denominated interpreted. We follow R. M. T. Dahlgren et al. (1985), who considered the fruits to be schizocarps with 1-seeded mericarps.

Although Linnaeus, in his original publication of the name, treated Triglochin as neuter, botanical tradition in North America and elsewhere has generally assigned feminine gender (ICBN International Code of Botanical Nomenlature, Art. 62.1); for this reason and because the Greek word gGlochin (g l w c i n ) is feminine (ICBN, Art. 62.2), the feminine gender is the more correct under the Code and is adopted in the Flora. The use of the neuter gender in some recent works appears to reflect a pre-1987 wording of the Code that was held to require adoption of the gender assigned by the original author.

Species ca. 12 (4 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Fertile pistils 6; fruiting receptacle without wings; ligule apically 2-lobed.
→ 2
1. Fertile pistils 3; fruiting receptacle with wings; ligule apically entire.
→ 3
2. Leaves typically shorter than scape, slender to thickish, erect from sheath; racemes 6–45 cm
T. maritima
2. Leaves usually equaling scape, very slender, curving outward from sheath at 30–50° angle; racemes 2–7 cm
T. gaspensis
3. Schizocarps linear; mericarps weakly ridged, more than 5 mm
T. palustris
3. Schizocarps globose; mericarps strongly 3-keeled, less than 2 mm
T. striata
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaginaceae > Triglochin Juncaginaceae
Sibling taxa
T. gaspensis, T. maritima, T. striata
Subordinate taxa
T. gaspensis, T. maritima, T. palustris, T. striata
Name authority Linnaeus: Sp. Pl. 1: 338. 1753 (as palustre) Linnaeus: Sp. Pl. 1: 338. 1753; Gen. Pl. ed. 5; 157, (1754)
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