Linum intercursum |
Linum catharticum |
|
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Bicknell's yellow flax, sandplain flax, sandplain yellow flax |
fairy flax, lin purgatif, purging flax, white flax |
|
Habit | Herbs or subshrubs, perennial, 20–92 cm, glabrous. | Herbs, 8–30 cm, glabrous. |
Stems | erect, unbranched proximal to inflorescence or few-branched at base. |
erect, usually unbranched proximal to inflorescence, sometimes branched from decumbent base. |
Leaves | proximalmost opposite, distalmost alternate, sometimes opposite nearly to inflorescence, erect to ascending; stipular glands absent; blade narrowly elliptic to oblanceolate, 8–27 × 1.2–5.6 mm, margins entire, not ciliate, apex acute; internal venation shown by transmitted light. |
blade narrowly elliptic to oblanceolate or narrowly obovate or oblong, larger 5–18 × 1.4–3.1 mm, largest at midstem, reduced in size both proximally and distally, apex obtuse to acute. |
Inflorescences | panicles. |
panicles. |
Pedicels | 0–5 mm. |
6–35 mm. |
Flowers | sepals persistent, lanceolate, 2–3 mm, margins not scarious, entire, or inner and rarely outer sparsely glandular-toothed, apex sharp-pointed; petals yellow, obovate, 4–7 mm; stamens 3 mm; anthers 0.5–1 mm; staminodia absent; styles distinct, 1.5–2.5 mm; stigmas capitate. |
sepals broadly lanceolate to ovate, outer sepals 2–3 mm, inner sepals broader, shorter, margins of all or sometimes only of inner sparsely but conspicuously glandular-toothed, apex acute to acuminate; petals white or whitish, base yellowish, 2–5 mm, obovate; stamens 1 mm, anthers 0.2–0.3 mm; styles 0.5–1 mm. |
Capsules | turbinate, 2–3 × 2–2.3 mm, apex acute or obtuse, dehiscing freely into 10, sharp-pointed 1-seeded segments, segments persistent on plant, false septa incomplete, proximal margins sparsely but conspicuously ciliate. |
ovoid, 2–2.5 × 2 mm, fragile and subject to crushing when pressed; segments persistent on plant, septa margins ciliate. |
Seeds | 1.3–1.8 × 0.6–0.9 mm. |
1–1.5 × 0.6–0.8 mm. |
2n | = 36. |
= 16. |
Linum intercursum |
Linum catharticum |
|
Phenology | Flowering Jun–Oct. | Flowering Jun–Aug. |
Habitat | sometimes in alternately wet and dry, hardpan soils. | Calcareous or sandy soils, fields, pastures, roadsides. |
Elevation | 0–800 m. (0–2600 ft.) | 0–400 m. (0–1300 ft.) |
Distribution |
AL; CT; DC; DE; GA; IN; MA; MD; NC; NJ; NY; PA; RI; SC; TN; VA
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MA; ME; MI; NH; NY; PA; VT; BC; NB; NF; NS; ON; PE; QC; Europe; w Asia; Atlantic Islands (Iceland) [Introduced in North America; introduced also in South America (Argentina), Pacific Islands (New Zealand), Australia (Tasmania)]
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Discussion | Linum intercursum is sometimes confused with L. floridanum, from which it differs by its pointed capsule and broader leaves. All parts of the flower of L. intercursum are yellow, and the corolla is nearly rotate. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Linum catharticum has small, white, funnelform corollas, yellow anthers, and light green stigmas. It is the only Linum in the flora area with white petals and opposite leaves. The species is widespread in Europe and occurs only sporadically in the northern United States and most of its range in Canada. It may be native in Newfoundland and Nova Scotia, where it is well established. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 382. | FNA vol. 12, p. 377. |
Parent taxa | Linaceae > Linum > sect. Linopsis | Linaceae > Linum > sect. Cathartolinum |
Sibling taxa | ||
Synonyms | Cathartolinum intercursum | |
Name authority | E. P. Bicknell: Bull. Torrey Bot. Club 39: 418. (1912) | Linnaeus: Sp. Pl. 1: 281. (1753) |
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