Polygonella parksii

Cory

Rhodora 39: 417. 1937.

Common names: Parks’s jointweed
IllustratedEndemicConservation concern
Treatment appears in FNA Volume 5. Treatment on page 539. Mentioned on page 535.

Herbs, annual, gynodioecious, 5.5–15 dm. Stems erect, usually branched proximally and distally, sometimes simple, glabrous. Leaves fugaceous; ocrea margins ciliate; blade linear, (0.9–) 4–10.5 (–15) × 0.3–0.8 mm, base barely tapered, margins hyaline, apex obtuse, glabrous. Inflorescences 2–6 (–8) mm; ocreola not encircling rachis, sides and bases adnate to rachis, apex acuminate. Pedicels spreading in anthesis, spreading to reflexed in fruit, 0.4–1.3 mm, much longer than subtending ocreola. Flowers bisexual or pistillate; outer tepals loosely appressed to spreading in fruit, white, distal portion of midrib often greenish, obovate to elliptic, 0.5–0.9 mm in anthesis, margins obscurely erose; inner tepals loosely appressed in anthesis and fruit, white, obovate to elliptic, 0.6–1.4 mm in anthesis, margins entire to erose; filaments dimorphic; anthers yellow or pink; styles and stigmas 0.1–0.3 mm in anthesis. Achenes exserted, yellowbrown, 3-gonous, 1.7–2.1 × 1.3–1.6 mm, shiny, smooth. 2n = 36.


Phenology: Flowering Jul–Oct.
Habitat: Deep, loose sand in oak woodlands, sandy rangeland, disturbed sites
Elevation: 100-200 m

Discussion

Of conservation concern.

Polygonella parksii is known from eight counties in south and east-central Texas. It appears to belong to a clade including P. articulata, P. americana, and P. myriophylla (P. O. Lewis and D. J. Crawford 1995).

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property.

... more about "Polygonella parksii"
winged +  and wingless +
yellowbrown +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
3-gonous +
1.3mm;1.6mm +
pink +  and yellow +
elliptic +  and ovate or round +
acuminate;obtuse +
Craig C. Freeman +
tapered +
1.05 cm10.5 mm <br />0.0105 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
filiform;broadly obovate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Parks’s jointweed +
obovate +  and elliptic +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
100-200 m +
curved +  and straight +
free +  and distinct +
disarticulating +  and solid +
decumbent to erect +  and prostrate +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
Deep, loose sand in oak woodlands, sandy rangeland, disturbed sites +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
obovate +  and elliptic +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
nonmembranous +
fugaceous +
entire +  and erose +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
swollen +
partly +  and foliaceous +
disintegrating +
deciduous +  and persistent +
cylindric +
coriaceous +  and chartaceous +
3 +  and 5 +
loosely appressed +  and spreading +
5 +, 1 +  and 2 +
anatropous +, , +  and orthotropous +
spreading;reflexed +
accrescent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
spreading;erect +
yellowish;greenish;yellowish;greenish;red;pink;white +
campanulate +
nonaccrescent +
fleshy +, indurate +  and membranous +
Flowering Jul–Oct. +
(2-)3(-4)-carpellate +
slender;stout +
horned +  and toothed +
Illustrated +, Endemic +  and Conservation concern +
simple +  and branched +
prostrate +  and decumbent +
penicillate +, fimbriate +  and capitate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +
spreading;erect +
Polygonella parksii +
Polygonella +
species +
transitional +  and petaloid +
distinct +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +