Cirsium andersonii |
Cirsium barnebyi |
|
---|---|---|
Anderson's thistle, rose thistle |
Barneby's thistle |
|
Habit | Perennials (but often appearing biennial), (15–)40–70(–100) cm; rootstocks producing erect, taprooted caudices and rosettes. | Perennials, 30–50 cm; caudices and woody taproots. |
Stems | usually 1, erect, subglabrous to puberulent and/or tomentose; branches 0–several, stiffly ascending. |
1–few, erect, gray-tomentose or glabrate; branches few, above middle, ascending. |
Leaves | blades ± elliptic, 8–35 × 4–8 cm, divided about halfway to midveins, lobes spreading, triangular, coarsely dentate or with a few broad lobes, obtuse to acute, main spines 1–5 mm, abaxial faces green or gray, thinly tomentose, adaxial green and glabrous to sparingly pilose; basal often present at flowering, spiny winged-petiolate; main cauline reduced distally, bases clasping; distal much reduced, linear-oblong, usually less deeply lobed and often spinier than proximal. |
blades oblong-elliptic, 10–35 × 2–7 cm, strongly undulate, margins shallowly to deeply lobed, lobes 8–15 pairs, linear-lanceolate to broadly triangular, closely spaced, spreading, coarsely spinose-dentate or cleft into 2–5 spine-tipped divisions, main spines 3–5 mm, faces densely gray-white-tomentose; basal usually present at flowering, winged-petiolate; principal cauline becoming sessile and progressively reduced distally, bases decurrent as spiny wings to 5 cm; distal cauline usually much reduced, less lobed. |
Peduncles | 0–20 cm. |
0–4 cm. |
Involucres | broadly cylindric to narrowly campanulate, 3–5 × 2–4 cm, loosely arachnoid or ± glabrous, finely short-ciliate. |
ovoid to hemispheric or campanulate, 1.7–2 × 1.5–2 cm, loosely arachnoid on phyllary margins or glabrate. |
Corollas | red to reddish purple, 30–45 mm, tubes 10–20 mm, throats 10–16 mm, lobes 9–11 mm; style tips 3.5–5 mm. |
lavender to pink-purple, 18–28 mm, tubes 7–9 mm, throats 4–8 mm, lobes 5–11 mm; style tips 3.5–5 mm. |
Phyllaries | in 6–8 series, imbricate, outer green, inner purple to red, linear-lanceolate (outer) to linear (inner), abaxial faces without glutinous ridge; outer and mid bodies short, appressed, entire or spinulose-ciliate, apices long-spreading to ascending, entire or spinulose-ciliate or rarely with expanded, fringed appendages, spines straight, weak, 1–3 mm; apices of inner red to purple, straight or rarely twisted, long, flat, entire. |
in 6–9 series, imbricate, ovate (outer) to linear-lanceolate (inner), entire, abaxial faces with narrow glutinous ridge; outer and middle appressed, spines ascending to spreading, stramineous, 2–7 mm; apices of inner often flexuous, narrow, flat, entire, spineless, glabrous. |
Heads | 1–6, borne singly or in corymbiform, racemiform, or spiciform arrays. |
1–20+, borne singly or clustered at branch tips, in leafy, ± corymbiform arrays. |
Cypselae | brown, 6–7 mm, apical collars narrow; pappi 25–40 mm. |
tan to brown, 5–5.5 mm, apical collars colored like body, narrow; pappi 15–23 mm. |
2n | = 32, 64. |
|
Cirsium andersonii |
Cirsium barnebyi |
|
Phenology | Flowering summer (Jul–Sep). | Flowering summer (Jun–Sep). |
Habitat | Moist to dry soils, openings in montane woodlands, montaine coniferous forests, aspen groves | Dry juniper woodlands, sagebrush scrub, on shale, limestone, sandstone |
Elevation | 1100–2900 m (3600–9500 ft) | 1600–2600 m (5200–8500 ft) |
Distribution |
CA; ID; NV
|
CO; UT; WY |
Discussion | Cirsium andersonii grows in the Cascade Range of northern California south through the Sierra Nevada of eastern California and western Nevada. It has been reported from the mountains of southwestern Idaho, but I have not seen specimens from there. Heads of Cirsium andersonii are actively visited by hummingbirds as well as a variety of insects (P. L. Barlow-Irick 2002). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Cirsium barnebyi occurs from the southern Rocky Mountains of southwestern Wyoming, northeastern Utah, and northwestern Colorado. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 145. | FNA vol. 19, p. 124. |
Parent taxa | Asteraceae > tribe Cardueae > Cirsium | Asteraceae > tribe Cardueae > Cirsium |
Sibling taxa | ||
Synonyms | Cnicus andersonii | |
Name authority | (A. Gray) Petrak: Bot. Tiddsskr. 31: 68. (1911) | S. L. Welsh & Neese: Brittonia 33: 296, fig. 3. (1981) |
Web links |