Polygonella fimbriata |
Polygonella robusta |
|
---|---|---|
sandhill jointweed |
largeflower jointweed, stout jointweed |
|
Habit | Herbs, annual, gynomonoecious, 1–6 dm. | Herbs, annual or perennial, gynomonoecious, 5–11 dm. |
Stems | erect, simple or sparingly branched proximally, scabrous or, sometimes, glabrous proximally. |
erect, usually branched at base, sometimes simple, glabrous or sparingly scabrous on angles distally. |
Leaves | persistent; ocrea margins ciliate; blade linear to falcate, (10–)19–36(–50) × (0.6–)1–1.5(–3) mm, base tapered, margins not hyaline, apex acuminate, minutely scabrous. |
persistent; ocrea margins ciliate; blade linear, (10–)25–43(–69) × 1.2–2.5(–3) mm, base barely tapered, margins hyaline, apex acute to acuminate, glabrous. |
Inflorescences | (5–)10–24(–30) mm; ocreola encircling rachis, only the base adnate to rachis, apex acuminate. |
(10–)20–50(–60) mm; ocreola encircling rachis, only the base adnate to rachis, apex acuminate. |
Pedicels | spreading in anthesis and fruit, 0.1–0.7 mm, as long as or much longer than subtending ocreola. |
spreading in anthesis and fruit, 0.3–1 mm, much longer than subtending ocreola. |
Flowers | bisexual or some pistillate, these usually distal; outer tepals loosely appressed in anthesis and fruit, pink with white margins, often drying orange, ovate, 1.1–2.3 mm in anthesis, margins erose; inner and transitional tepals loosely appressed in anthesis and fruit, pink with white margins, often drying orange, oblong, 1.2–2.2 mm in anthesis, margins deeply fringed; filaments monomorphic; anthers pink; styles and stigmas 0.6–1.3 mm in anthesis. |
bisexual or some pistillate, these usually distal; outer tepals loosely appressed in anthesis and fruit, pink to white, drying orange, ovate, 1.7–4.5 mm in anthesis, margins erose; inner and transitional tepals pink to white, drying orange, loosely appressed in anthesis and fruit, oblong, 1.8–3.8 mm in anthesis, margins deeply fringed; filaments monomorphic; anthers pink; styles and stigmas 0.7–1.5 mm in anthesis. |
Achenes | included or exserted, yellow-brown, 3-gonous, 1.5–2.5 × 1–1.5 mm, shiny and smooth proximally, dull to shiny and minutely roughened distally. |
usually included, sometimes exserted distally, yellow-brown, 3-gonous, 1.8–2.6 × 1–1.5 mm, shiny and smooth proximally, dull to shiny and minutely roughened distally. |
2n | = 32. |
|
Polygonella fimbriata |
Polygonella robusta |
|
Phenology | Flowering Jul–Oct. | Flowering Jul–Dec. |
Habitat | Sandy pine-oak forests and sandhills | Sandy roadsides, waste places, scrub |
Elevation | 10-200 m (0-700 ft) | 0-60 m (0-200 ft) |
Distribution |
AL; FL; GA
|
FL |
Discussion | The chromosome number of 2n = 32 listed for Polygonella fimbriata by P. O. Lewis and D. J. Crawford (1995) appears to be in error. They cited J. H. Horton (1963) as the source; Horton did not count this species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Polygonella robusta is closely related to P. fimbriata and has been treated as a variety thereof. Differences in morphology and distribution provide a basis for treating the two taxa as separate species (G. L. Nesom and V. M. Bates 1984). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 536. | FNA vol. 5, p. 536. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonella | Polygonaceae > subfam. Polygonoideae > Polygonella |
Sibling taxa | ||
Synonyms | Polygonum fimbriatum, Thysanella fimbriata | Thysanella robusta, P. fimbriata var. robusta |
Name authority | (Elliott) Horton: Brittonia 15: 190. (1963) | (Small) G. L. Nesom & V. M. Bates: Brittonia 36: 43. (1984) |
Web links |