Polygonum polygaloides subsp. esotericum

(L. C. Wheeler) J. C. Hickman

Madroño 31: 251. 1984.

Common names: Modoc County knotweed
Endemic
Basionym: Polygonum esotericum L. C. Wheeler Rhodora 40: 310, fig. 1. 1938
Treatment appears in FNA Volume 5. Treatment on page 567. Mentioned on page 565.

Stems 5–12 cm. Inflorescences continuous from bases of branches or stems, narrowly cylindric, 2–10 × 5–7 mm; bracts appressed, elliptic-lanceolate, 4–8 mm, rigid, margins flat, green, if white then scarious portion 0.1–0.2 mm wide; lateral and midveins prominent adaxially. Flowers: perianth 2.1–2.9 mm; tube 29–40% of perianth length; tepals white or pink; perianth-tube and base of tepals smooth; stamens 5–8. Achenes dark-brown, lanceolate, 2–2.5 mm, reticulately ridged to almost smooth, dull.


Phenology: Flowering Jun–Aug.
Habitat: Vernal pools, seasonally wet places, desert scrub, pinyon and juniper woodlands
Elevation: 1400-1600 m

Discussion

Selected References

None.

Lower Taxa

None.

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

reticulate +, tubercled +  and smooth +
exserted +  and included +
ridged +  and lanceolate +
pink +  and purple +
elliptic +  and oblong +
acute;acuminate +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
(L. C. Wheeler) J. C. Hickman +
not stipelike +
Polygonum esotericum +
narrowly linear;subround +
coriaceous +
foliaceous +  and perfoliate +
elliptic-lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
just below the soil surface or and above the soil surface +  and spreading +
Modoc County knotweed +
1-3-flowered +
Calif. +  and Oreg. +
1400-1600 m +
reticulate +  and smooth +
dull +  and shiny +
subequal +
adnate +, free +  and distinct +
semi-open +  and open +
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 +
Vernal pools, seasonally wet places, desert scrub, pinyon and juniper woodlands +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
nonmembranous +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
articulated +
distributed +
deciduous +
white +  and green +
not rugulose +
papillose-denticulate +
with 2 lateral branches +  and unbranched +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
accrescent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
spreading;erect +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
fleshy +, indurate +  and membranous +
not +  and articulated +
Flowering Jun–Aug. +
(2-)3(-4)-carpellate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
papillose-scabridulous +  and smooth +
slender;stout +
woody +  and fibrous +
5 +  and 8 +
wiry +, simple +  and branched +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
zigzagged +  and straight +
papillous-scabridulous +
4-gonous +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
2 +  and 3 +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
connate +  and distinct +
spreading;erect +
Undefined sect. Duravia +  and Polygonum sect. Monticola +
Polygonum polygaloides subsp. esotericum +
Polygonum polygaloides +
subspecies +
overlapping +
pink +  and white +
connate +  and distinct +
keeled +, navicular +  and oblong-lanceolate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
inconspicuous +
heterophyllous +  and homophyllous +