Pyrrocoma racemosa

(Nuttall) Torrey & A. Gray

Fl. N. Amer. 2: 244. 1842.

Common names: Clustered goldenweed
Endemic
Basionym: Homopappus racemosus Nuttall Trans. Amer. Philos. Soc., n. s. 7: 332. 1840
Synonyms: Haplopappus racemosus (Nuttall) Torrey
Treatment appears in FNA Volume 20. Treatment on page 421. Mentioned on page 414, 415, 423.

Plants 20–75 cm. Stems 2–5, erect or strongly ascending, brownish to red-tinged, bases often curved, sparsely to moderately leafy, usually glabrous, sometimes sparsely tomentulose or villous, eglandular. Leaves: basal (tufted) petiolate, blades lanceolate or oblanceolate to elliptic, 50–200 (–300) × 4–30 mm, margins spinulose-serrate to entire or undulate, ciliate, apices acute, sometimes recurved; cauline sessile, blades lanceolate, 10–40 × 2–4 mm, reduced distally; faces usually glabrous, sometimes villous. Heads (1–) 3–15+ in spiciform, racemiform, or narrowly paniculiform arrays. Peduncles 0–2 cm. Involucres hemispheric to campanulate, 5–15 × 5–18 mm. Phyllaries in 4–5 series, lanceolate to oblanceolate or oblong, 6–13 mm, strongly unequal, margins sometimes ciliate, apices green, obtuse or acute, sometimes recurved, faces glabrous, sparsely tomentulose, or densely villous. Ray-florets 7–28; corollas 5–12 mm. Disc-florets 20–65; corollas 5–8 mm. Cypselae subcylindric, 2.5–5.5 mm, 4-angled, faces often sericeous or nearly glabrous; pappi tawny, 6.5–8.5 mm.

Distribution

V20-970-distribution-map.gif

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

Discussion

Varieties 5 (5 in the flora).

Pyrrocoma racemosa is generally recognized by its erect stems, tufted leaves, and few to many heads in elongate, racemiform or spiciform arrays. It is the most variable species of Pyrrocoma, with numerous named varieties and subspecies. R. A. Mayes (1976) suggested that P. racemosa is closely related to the small-headed, racemiform species P. uniflora, P. apargioides, and P. lucida. The varieties are intergrading, making them somewhat difficult to identify.

Selected References

None.

Key

1 Involucres 10–15 mm > 2
1 Involucres 5–9 mm > 3
2 Stems villous; basal leaf blades lanceolate; phyllaries densely villous Pyrrocoma racemosa var. pinetorum
2 Stems usually glabrous, rarely tomentulose; basal leaf blades oblanceolate to elliptic; phyllaries glabrous Pyrrocoma racemosa var. racemosa
3 Arrays narrowly paniculiform, racemiform, or spiciform, heads crowded only distally Pyrrocoma racemosa var. paniculata
3 Arrays usually glomerate-spiciform, heads crowded > 4
4 Involucre 12–16 mm wide; phyllaries yellowish green, apices erect, faces sparsely tomentose at least proximally Pyrrocoma racemosa var. congesta
4 Involucre 5–7 mm wide; phyllaries with pale chartaceous bases, apices recurved, green, faces glabrous Pyrrocoma racemosa var. sessiliflora

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

... more about "Pyrrocoma racemosa"
not tailed +, rounded +  and obtuse +
distinct +
acute;obtuse;acute +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, racemiform +  and spiciform +
indeterminate +  and determinate +
David J. Bogler +
(Nuttall) Torrey & A. Gray +
oblanceolate +
eglandular +  and leafy +
serrate or shallowly laciniate +, spinulose-dentate +  and entire +
linear +  and elliptic +
villous +, tomentulose +  and glabrous +
attenuate +
3mm;30mm +
Homopappus racemosus +
compound +  and simple +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
lanceolate;oblanceolate;elliptic +
reduced +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
rugulose +  and muricate +
barbellulate +  and barbellate +
Clustered goldenweed +
not 2-lipped +  and actinomorphic +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
4-angled +  and subcylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +, Idaho +, Nev. +, Oreg. +  and Utah +
glabrous +, sericeous +, villous +  and tomentulose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and disciform +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
hemispheric;campanulate +
0.5 cm5 mm <br />0.005 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
linear +  and elliptic +
undulate +  and entire +
3mm +  and 30mm +
2-carpellate +
persistent +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
with distinct , green apical patch +  and yellow-green +
appressed +  and loosely spreading +
lanceolate +  and oblanceolate or oblong +
0.6 cm6 mm <br />0.006 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
brownish +  and red-tinged +
ascending +  and erect +
2 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus racemosus +
Pyrrocoma racemosa +
Pyrrocoma +
species +
tubular-funnelform +
50 cm500 mm <br />0.5 m <br /> (90 cm900 mm <br />0.9 m <br />) +
stipitate-glandular +, glabrous +, tomentose +  and sericeous +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +