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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
from FNA
AL; FL; GA
[WildflowerSearch map]
from FNA
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
P. americana, P. articulata, P. basiramia, P. ciliata, P. gracilis, P. macrophylla, P. myriophylla, P. parksii, P. polygama, P. robusta
P. americana, P. articulata, P. basiramia, P. ciliata, P. fimbriata, P. gracilis, P. macrophylla, P. myriophylla, P. parksii, P. polygama
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)
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