Cirsium praeteriens

J. F. Macbride

Contr. Gray Herb. 53: 19. 1918.

Common names: Lost or Palo Alto thistle
EndemicConservation concern
Treatment appears in FNA Volume 19. Treatment on page 160. Mentioned on page 101, 161.

Biennials or perennials, probably more than 100 cm; rootstock unknown. Stems stout, erect, loosely arachnoid with fine trichomes and villous with jointed trichomes; branching unknown. Leaves: blades elliptic to oblanceolate, 15–30+ × 6–8+ cm, divided halfway or more to midveins, lobes linear-lanceolate, rigidly spreading, entire or trifid, acuminate, main spines stout, 5–15 mm, abaxial faces tomentose with fine, non-septate trichomes, villous along major veins with septate trichomes, adaxial glabrescent or sparsely tomentose, villous along veins; basal not observed; cauline well distributed, distally not much reduced, sessile, bases clasping, not decurrent. Heads 1–5, terminal and in distal axils in spiciform arrays. Peduncles 0–1 cm. Involucres hemispheric to broadly campanulate, 3–4 × 4–5+ cm, arachnoid. Phyllaries in 6–8 series, narrowly lanceolate to linear, outer subequal, rigidly spreading, spines 5–10 mm, inner ± imbricate, bodies appressed, glutinous ridge absent, apices spreading, margins spinulose or scabrid, apices of mid and inner flattened, spineless, scabrid. Corollas white, 30–33 mm, tubes 16 mm, throats 9–12 mm, lobes 5.5–9 mm; style tips 6 mm. Cypselae light-brown, 6 mm, collars also light-brown, ca. 0.75 mm; pappi 25–33 mm.


Phenology: Flowering summer (Jun–Jul).
Habitat: Habitat unknown
Elevation: 0–100 m

Discussion

Of conservation concern.

Cirsium praeteriens is known only from Santa Clara County, where J. W. Congdon collected it in Palo Alto in 1897 and 1901. It is presumed extinct.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium praeteriens"
villous +  and tomentose +
villous +, tomentose +  and glabrescent +
short-tailed +
dentate +, entire +  and spine-tipped +
innermost +
scarious +
indeterminate +  and determinate +
David J. Keil +
J. F. Macbride +
not decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
divided;elliptic;oblanceolate +
6cm;8cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
? (?) +  and Flattened (?) +
light-brown +
0.75 cm7.5 mm <br />0.0075 m <br /> (?) +
Lost or Palo Alto thistle +
actinomorphic +
3 cm30 mm <br />0.03 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
0–100 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Habitat unknown +
indeterminate +
each +  and sessile +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
hemispheric;broadly campanulate +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
acuminate +, trifid +, entire +  and linear-lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
usually lobed +  and dissected +
2-carpellate +
persistent +
2.5 cm25 mm <br />0.025 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering summer (Jun–Jul). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
Contr. Gray Herb. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
Endemic +  and Conservation concern +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
6 cm60 mm <br />0.06 m <br /> (?) +
Compositae +
Cirsium praeteriens +
species +
cylindric +
expanded +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
bristly-dentate to coarsely +
septate +, non-septate +  and jointed +
slender +
16 cm160 mm <br />0.16 m <br /> (?) +
perennial +  and biennial +
5 cm50 mm <br />0.05 m <br /> (400 cm4,000 mm <br />4 m <br />) +
tree +, vine +, shrub +  and subshrub +