Askellia pygmaea

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Askellia pygmaea

https://pictures.bgbm.org/digilib/Scaler?fn=Cichorieae/Askellia_pygmaea_A_02.jpg&mo=file

Common names

Chinese (China): 矮小假苦菜 ai xiao jia ku caiA; French (Northern America): Crépis nainB

Description

Herbs 2–4 cm tall, perennial, glabrous, glaucescent. Roots shoot-bearing; subterranean shoots slender, often branched. Stem delicate, branched from base, leafy. Basal and stem leaves with a 4–14 mm petiole; leaf blade ovate, orbicular, or elliptic, 1–2.6[–3.5] × 0.4–1[–1.7] cm, base cuneate, margin entire, apex rounded to acute. Synflorescence tufted-corymbiform, with few to many capitula. Capitula with 9–11 florets; peduncle filiform, most shorter than involucre. Involucre narrowly cylindric, 9–10 × 2–3 mm. Phyllaries green, abaxially glabrous, margin scarious; outer phyllaries ovate to lanceolate, longest 2–3 mm, apex acute; inner phyllaries 8, apex ± acute. Florets yellow. Corolla 7–9 mm. Anther tube 2–2.5 mm. Achene pale yellowish, columnar to fusiform, ca. 5 mm, apically more strongly attenuate. Pappus 4–5 mm. Fl. and fr. Jun–Sep. 2n = 14.

from: Shih C. & Kilian N. in Wu Z. Y. & al. (ed.), Flora of China 20–21: 327. 2011, Beijing & St Louis.


Herb, perennial, rhizomatous, (3)-10-20 cm high, with taproot. Caudex 1.0-4.0 cm, branched. Flowering stems 1-10 (or more), erect or ascending, terete, medullary, often tinged purple, glabrous, striate, robust, unbranched or branched; branches remote. Rosette leaves oblong, ovate, elliptic or obovate, 1.5-6.0-(9.0) cm long, 0.4-1.3-(2.5) cm wide, entire, lyrate-pinnatipartite or lyrate, entire or dentate, subacute or obtuse, petiole-like attenuate, glaucous or tinged purple at base; lateral lobes 2-6. Cauline leaves ovate to obovate to circular, 2.0-9.0 cm long, 0.5-2.5 cm wide, entire, runcinate or lyrate-pinnatifid, entire or dentate, acute to obtuse, petiole-like attenuate, glabrous, glaucous and tinged purple often, the upper ones reduced to scales. Synflorescence corymbiform or paniculiform, with 5-80 (or more) heads. Peduncle 0.3-2.0 cm long. Heads with 9-12 flowers. Involucre at flowering cylindrical, 8.0-13.0 mm long, at flowering (1.5)-3.0-4.0 mm in diameter; involucral bracts 10.0-11.0 mm long, glabrous, margin scarious or sometimes white scarious; outer involucral bracts ovate to oblong, acute; inner involucral bracts linear to oblong, obtuse, margin sometimes minutely ciliate at apex, white scarious. Receptacle areolate or foveolate, naked. Corolla ligulate, 7.0-12.0 mm long, yellow; tube 3.5-4.0-(5.0) mm long, glabrous; ligule up to 1.5 mm wide, tinged purple on outer face. Anthertube 2.3-2.5 mm long; apical appendages acuminate, 0.8-0.9 mm long. Style branches 0.8-1.1 mm long, yellow. Achenes cylindrical to fusiform in outline, 4.0-8.0 mm long, 0.5-0.7 mm wide, scabrid, smooth or wrinkled, subterete, yellowish brown, with 10-13 ribs, attenuate into an ill-defined beak or attenuate; beak c. 1.0 mm long. Pappus white, 4.0-6.0-(7.0) mm long, persistent or caducous, flexible.

Based on: Babcock, E. B. 1947: The genus Crepis 2. – Univ. Calif. Publ. Bot. 22 (as Crepis nana); Bobrov, E. G. and Tzvelev, N. N. (ed.) 2000: Flora of the USSR 29, Compositae, Tribe Cichorieae. – Enfield (as Crepis nana); Bogler, D. J.: 36. Crepis Linnaeus. – Pp. 222-239 in: Flora of North America Editorial Com. (ed.), Flora of North America 19. – New York: Oxford University (as Crepis nana).

Distribution

Asia-Temperate: Altay nativeC,D; Buryatiya nativeD; Chita nativeD; Irkutsk nativeD; Kamchatka nativeE,F; Kazakhstan nativeA,G; Khabarovsk nativeE; Krasnoyarsk nativeH,I; Magadan nativeE,F; Mongolia nativeA,J; Tibet nativeA; Tuva nativeD; Uzbekistan nativeK; Xinjiang nativeA,L; Yakutskiya nativeI Northern America: Alaska nativeM,N; Alberta nativeN,O; British Columbia nativeN,O; California nativeN; Colorado nativeN; Greenland nativeO; Idaho nativeN; Labrador nativeN,O; Montana nativeN; Nevada nativeN; Newfoundland (Newfoundland nativeN,O); Northwest Territories nativeN,O; Nunavut nativeN,O; Oregon nativeN; Utah nativeN; Washington nativeN; Wyoming nativeN; Yukon nativeN,O

Credits

Dürbye T. 2009: Images (2 added)
Enke N. 2009: Images (2 added)1
1.  This fact has been moved from Askellia nana (Richardson) W. A. Weber to this taxon.

Bibliography

A. Wu & al., Flora of China 20-21. 2011
B. Brouillet L., Coursol F., Favreau M. & Anions M., VASCAN, the Database of Vascular Plants of Canada (as Askellia nana (Richardson) W. A. Weber)
C. Krasnoborov I. M., Opredelitel' rastenij Respubliki Altaj. 2012: 474 (as Crepis nana Richardson)
D. Lomonosova M. N. - 90. Crepis L. in Krasnoborov I. M., Flora of Siberia 13. 2007 (as Crepis nana Richardson)
E. Charkevič S. S., Sosudistye rastenija sovetskogo Dal’nego Vostoka 6. 1992 (as Crepis nana Richardson)
F. Tolmačev A. J., Arktičeskaja Flora SSSR 10. 1987 (as Askellia nana)
G. Pavlov N. V., Flora Kazachstana 9. 1966 (as Crepis nana Richardson)
H. Lomonosova M. N. - 90. Crepis L. in Krasnoborov I. M., Flora of Siberia 13. 2007 (as Askellia nana)
I. Tolmačev A. J., Arktičeskaja Flora SSSR 10. 1987 (as Crepis nana Richardson)
J. Grubov V. I., Key to the Vascular Plants of Mongolia II. 2001 (as Crepis nana Richardson)
K. Kovalevsk. - in Vvedensky, Fl. Uzbekistan. 6. 1962 (as Youngia pygmaea (Ledeb.) Ledeb.)
L. C. Shih, Flora Reipublicae Popularis Sinicae 80(1). 1997
M. Babcock E. B., Youngia americana, a new species of phyletic significance in Madroño 11: 1-6. 1951 (as Youngia americana Babc.)
N. Bogler D. J. - 36. Crepis in Flora of North America Editorial Committee (ed.), Flora of North America. North of Mexico 19. 2006 (as Crepis nana Richardson)
O. Brouillet L., Coursol F., Favreau M. & Anions M., VASCAN, the Database of Vascular Plants of Canada (as Askellia nana (Richardson) W. A. Weber)