Chamaebatiaria millefolium

(Torrey) Maximowicz

Trudy Imp. S.-Peterburgsk. Bot. Sada 6: 225. 1879.

EndemicIllustrated
Basionym: Spiraea millefolium Torrey in War Department [U.S.], Pacif. Railr. Rep. 4(5): 83, plate 5. 1857
Treatment appears in FNA Volume 9. Treatment on page 395.

Stems: internodes (1–) 6–12 mm. Leaves: stipules 2–4 mm, green on leaf base margins; blade 2.6–7 (–9.6) × 0.9–2 (–3) cm, 1 (–2) -pinnate-pinnatifid into 13–25 pairs of pinnae; pinnae oblong-lanceolate, (4–) 6–14 (–16) × 2–4 mm, divided into 6–10 opposite or alternate pairs of obovate to ovate segments 0.8–2 mm; segments obtuse-rounded, entire or secondarily lobed on proximal margins, proximal margins decurrent along rachillae extending to subtending divisions (pinnae then pinnatifid and leaves then 2-pinnate), pinnae margins of proximalmost lobes decurrent along adaxial leaf-rachises, abaxial surfaces of rachises, rachillae, and petioles hairy, adaxial glabrous. Inflorescences 3–15 (–23) × 2–8 (–12) cm, leafy proximally, flowers crowded along distal branches; lobes of distal bracts and bracteoles acute. Flowers: sepals valvate, 2.5–4 mm, acute, abaxial surface hairy, glandular; petals spreading, margins erose, glabrous; filaments spreading, inner more erect, 3–4 mm, glabrous, anthers orbicular, introrse, versatile, 0.4–0.5 mm; styles 3–5 mm. Follicles reddish-brown, leathery, hairy. Seeds yellowish, 2.5–3.5 mm. 2n = 18.


Phenology: Flowering Jul–Sep.
Habitat: Dry, rocky sagebrush scrub, pinyon-juniper woodlands, montane coniferous forests to subalpine woodlands
Elevation: 900–3400 m

Distribution

V9 662-distribution-map.jpg

Ariz., Calif., Idaho, Nev., Oreg., Utah.

Discussion

Chamaebatiaria millefolium grows in southern Oregon, northern California, and the eastern slope of the Sierra Nevada to southern Idaho, Nevada, north-central Arizona, and western Utah.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

orbicular +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
James Henrickson +
(Torrey) Maximowicz +
compound +  and simple +
opposite +  and alternate +
short-clawed +
Spiraea millefolium +
7 cm70 mm <br />0.07 m <br /> (9.6 cm96 mm <br />0.096 m <br />) +
7 cm70 mm <br />0.07 m <br /> (9.6 cm96 mm <br />0.096 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
2.6 cm26 mm <br />0.026 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1(-2)-pinnate-pinnatifid +
2.6 cm26 mm <br />0.026 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.9cm +  and 2cm +
1(-2)-pinnate-pinnatifid +
entire +, pinnate-lacerate +  and lanceolate +
Ariz. +, Calif. +, Idaho +, Nev. +, Oreg. +  and Utah. +
not +  and aggregated +
900–3400 m +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Dry, rocky sagebrush scrub, pinyon-juniper woodlands, montane coniferous forests to subalpine woodlands +
aromatic +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
15 cm150 mm <br />0.15 m <br /> (23 cm230 mm <br />0.23 m <br />) +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
3cm +  and 15cm +
2cm +  and 8cm +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
crassinucellate +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
opposite +  and alternate +
persistent +
reduced +
toothed-lobed +  and entire +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
10 +  and 12 +
alternate +  and opposite +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
2 +  and 5 +
Flowering Jul–Sep. +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
adnate +, free +, connate +  and distinct +
Trudy Imp. S.-Peterburgsk. Bot. Sada +
fusiform +
2.5mm +  and 3.5mm +
persistent +
free +  and distinct +
erect +  and spreading +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
ascending-spreading +
1 +  and 10 +
broadened +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not +, persistent +  and caducous +
distinct +
lateral +  and terminal +
not elongate +
slender +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
stellate-hairy +  and glabrous +
Chamaebatiaria millefolium +
Chamaebatiaria +
species +
inconspicuous +
erect +  and widely spreading +