Oxytheca dendroidea subsp. dendroidea

Common names: Treelike puncturebract
IllustratedEndemic
Treatment appears in FNA Volume 5. Treatment on page 435.
Please click on the illustration for a higher resolution version.
Illustrator:

Copyright:

Plants erect to spreading, 0.4–4 × 0.3–4.5 dm. Stems sparsely to densely glandular. Leaf-blades linear to linear-oblanceolate, 1–4.5 × 0.1–0.7 cm, densely hirsute, sparsely glandular. Inflorescences open to diffuse, 0.5–4 dm; bracts (2–) 3 (–4) at first node, otherwise 2–3 and distinct or basally connate, linear to subulate or triangular, 1–18 × 0.5–4 mm, scalelike or sometimes leaflike, hirsute and glandular; awns 0.2–0.5 mm, often absent at distal nodes. Peduncles occasionally absent at distal nodes, erect or deflexed, slender, 0.5–1.5 cm. Involucres 1–2 mm, typically glabrous, rarely with few scattered hairs abaxially; teeth (3–) 4; awns grayish, 0.5–3 mm. Flowers 2–6; perianth white to pink, 1–2 mm, glabrous or strigose and sparsely glandular abaxially; tepals dimorphic, margins essentially entire, those of outer whorl elliptic to ovate and pubescent adaxially, those of inner whorl elliptic or oblong to narrowly ovate and glabrous or sometimes strigose adaxially proximally; filaments 0.5–1.5 mm, glabrous; anthers cream to red, oval, 0.2–0.3 mm. Achenes yellowbrown to maroon, 2–2.5 mm. 2n = 40.


Phenology: Flowering Jun–Oct.
Habitat: Dry, sandy to rocky flats, washes, and slopes in mixed grassland, saltbush, sagebrush communities, pinyon and/or juniper and montane conifer woodlands
Elevation: 300-3000 m

Distribution

V5 908-distribution-map.gif

Calif., Idaho, Nev., Oreg., Wash., Wyo.

Discussion

Subspecies dendroidea is common and widespread in western North America from southeastern Oregon to southwestern Wyoming southward into eastern California (as far south as Inyo County), Nevada (to Nye County), but surprisingly unknown from northern Utah. Populations in Washington and Wyoming are extensions of the Snake River Plains populations found in Idaho.

Selected References

None.

Lower Taxa

None.

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

yellowbrown;maroon +
globose-lenticular +
cream +  and red +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
James L. Reveal +
Nuttall +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
stipelike +
awn-tipped +  and simple +
linear;spatulate +
connate +  and distinct +
0.1 cm1 mm <br />0.001 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
scale-like +, linear +  and subulate or triangular +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
disarticulating +  and dichotomous +
not brittle +
glandular +  and glabrous +
just below the soil surface or and above the soil surface +  and spreading +
Treelike puncturebract +
Calif. +, Idaho +, Nev. +, Oreg. +, Wash. +  and Wyo. +
300-3000 m +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
unisexual +  and bisexual +
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 +
Dry, sandy to rocky flats, washes, and slopes in mixed grassland, saltbush, sagebrush communities, pinyon and/or juniper and montane conifer woodlands +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
turbinate +  and tubular +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
nonmembranous +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
linear +  and linear-oblanceolate +
0.1cm;0.7cm +
deciduous +  and persistent +
bractlike +
strigose +, glabrous +  and pubescent +
oblong +  and narrowly ovate +
connate +  and distinct +
glabrous +  and pubescent +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
deflexed;erect +
erect to deflexed +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
strigose +  and glabrous +
urceolate +  and campanulate +
accrescent +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
Flowering Jun–Oct. +
homostylous +  and 3-carpellate +
Proc. Acad. Nat. Sci. Philadelphia +
, +  and solid +
slender;stout +
Illustrated +  and Endemic +
disarticulating +  and solid +
decumbent to spreading or erect +  and prostrate +
erect +  and spreading +
pubescent +  and glabrous +
not fistulose +
slender +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
spreading;erect +
Eriogonum dendroideum +
chambered +, , +  and solid +
Oxytheca dendroidea subsp. dendroidea +
Oxytheca dendroidea +
subspecies +
1/4 +  and 1/3 +
lobed +  and laciniate +
coriaceous +
erect +  and spreading +
persistent +
membranous +
pubescent +  and glabrous +
3 +, 2 +  and 1 +