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Post by Melanie on Jul 5, 2008 1:31:04 GMT 1
SPECIES: Palo Alto lost thistle (Cirsium praeteriens) LISTING STATUS: CNPS List 1A (presumed extinct in California) FIRST/LAST RECORDED: 1897/1901 RANGE: known only from Palo Alto in Santa Clara County HABITAT: unknown FIELD NOTES: with nothing but "Palo Alto" recorded for the type specimen's collection location, botanists know nothing about this thistle's preferred habitat; notes to the effect that the species represents an introduction from the Old World are unsubstantiated and the species is still recognized today as a native California thistle www.baynature.org/articles/web-only-articles/field-guide-to-the-lost-species-of-the-san-francisco-bay-area |
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Post by Melanie on Jul 5, 2008 1:37:25 GMT 1
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Post by Melanie on Jul 5, 2008 1:39:04 GMT 1
Lost or Palo Alto thistle 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. Flowering summer (Jun–Jul). Habitat unknown; of conservation concern; 0–100 m; Calif. 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. www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066393 |
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Post by Melanie on Jul 5, 2008 1:45:44 GMT 1
Family Asteraceae Basionym Cirsium praeteriens J. F. Macbride Type Status holotype Publication Contr. Gray Herb. 53: 19. 1918. Verified by V. Bates COLLECTION Date July Country United States of America State/Province California County Santa Clara County City/Town Palo Alto CURATION Herbarium GH Barcode 4896 Format on sheet Reproductive state not specified ids.lib.harvard.edu/ids/view/1185124 |
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Post by Melanie on Jul 5, 2008 1:47:41 GMT 1
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Post by Melanie on Jul 5, 2008 3:09:13 GMT 1
Taxonomic Comments: Based on two collections from Palo Alto, 1897 and 1901; "perhaps represents a casual introduction from the Old World ... renamed as a native" (J.H. Thomas, Flora Santa Cruz Mtns, 1961). David Keil of Cal. Poly. (an expert on Asteraceae) gave this another look and determined C. praeteriens to be a "morphologically very distinct" species, now extinct (Roxanne Bittman, pers. comm. to K. Maybury, 3/5/97, and to L. Morse 9Sep98). Resembles Cirsium andrewsii, native nearby in San Francisco area, but differs from that species in having long involucral spines (Thomas, 1961). Kartesz (1999 floristic synthesis) accepts this species as a native Californian endemic, presumed extinct.
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Post by koeiyabe on Jan 3, 2020 19:19:55 GMT 1
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Post by koeiyabe on Jan 11, 2021 22:25:25 GMT 1
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