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28. Olgaea Iljin, Bot. Mater. Gerb. Glavn. Bot. Sada R.S.F.S.R. 3: 141. 1922.
蝟菊属 wei ju shu
Authors: Zhu Shi & Werner Greuter
Takeikadzuchia Kitagawa & Kitamura.
Herbs, perennial. Leaves linear to elliptic, pinnately divided, with spiny teeth or segments. Capitula few to many, solitary or glomerate. Involucre campanulate, semiglobose, or ovoid. Phyllaries rigid, leathery, straight or apically recurved. Receptacle flat, with dense long bristles. Corolla purple to blue. Stamen filaments glabrous or subglabrous; anther with long ± entire basal appendages. Style branches slender, apex obtuse to rounded. Achene narrowly ellipsoid to obovoid, laterally compressed, often with 12-15 ribs but otherwise smooth; apical rim forming a crenulate crown; apical plate with central pyramidal body of sclerenchyma crowned by a stout disk. Pappus bristles 3-5 rows, barbellate, outer ones somewhat shorter than inner.
About 16 species: mostly in C Asia; six species (two endemic) in China.
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| 1 |
Stem winged |
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(2) |
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Stem unwinged |
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(4) |
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| 2 (1) |
Basal leaves papery and soft in texture, with elliptic to ovate segments; involucre sparsely cobwebby. |
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1 O. lomonossowii |
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Basal leaves ± leathery, with triangular segments or teeth; involucre glabrous or subglabrous |
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(3) |
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| 3 (2) |
Leaves subconcolorous, adaxially ± densely cobwebby; basal leaves ± narrowly elliptic, 3-5 cm wide; leaves and stem wings parchmentlike; phyllaries 2-3 mm wide. |
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2 O. leucophylla |
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Leaves strongly discolorous, adaxially green and glabrous; basal leaves ± broadly linear, ca. 3 cm wide; leaves and stem wings leathery; phyllaries 1-1.5 mm wide. |
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3 O. tangutica |
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| 4 (1) |
Capitula solitary at end of stem and branches; involucre sparsely cobwebby. |
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4 O. pectinata |
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Capitula clustered at end of unbranched stem; involucre densely lanate |
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(5) |
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| 5 (4) |
Involucre 2.5-3.5 cm in diam.; outer and middle phyllaries with a 1-1.5 cm pungent apical spine; small capitula usually present in leaf axils below main capitula cluster. |
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5 O. roborowskyi |
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Involucre ca. 4.5 cm in diam.; outer and middle phyllaries apically with a short weak spine; small capitula not present in leaf axils below main capitula cluster. |
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6 O. laniceps |
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Lower Taxa
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