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FOC | Family List | FOC Vol. 20-21 | Asteraceae

170. Tripleurospermum Schultz Bipontinus, Tanaceteen. 31. 1844.

三肋果属 san lei guo shu

Authors: Zhu Shi, Christopher J. Humphries & Michael G. Gilbert

Chamaemelum Visiani (1845), not Miller (1754); Dibothrospermum Knaf; Rhytidospermum Schultz Bipontinus.

Herbs, annual or perennial; indumentum absent or of simple, basifixed hairs. Leaves 2- or 3-pinnatisect. Synflorescences cymose; capitula solitary or in ± flat-topped panicles, pedunculate, heterogamous or homogamous, radiate or discoid. Involucres hemispheric; phyllaries in 2-4 rows, scarious margins often narrow, white or pale to dark brown. Receptacle convex to conical, epaleate. Marginal florets in 1 row, female, lamina white or rarely pale pink. Disk florets bisexual; corolla tubular, apex 5-lobed; lobes each usually with resin sac. Anther bases obtuse, apical appendage ovate-triangular or oblong. Style branches with apex truncate. Achenes 3-angled, often wrinkled or tuberculate, with 1 adaxial and 2 lateral, and sometimes 1 or 2 abaxial, white ribs, abaxially and apically with (1 or)2(-5) distinct resin sacs. Corona present, sometimes forming an auricle, or with a few scales, sometimes absent.

Thirty-eight species: Europe and temperate Asia, a few species in N Africa and North America; five species (one endemic) in China.

1 Plants perennial, with rhizome; phyllaries with dark brown scarious margins   (2)
+ Plants annual or biennial, without rhizome; phyllaries with white or paler brown scarious margins   (3)
2 (1) Capitula heterogamous, radiate.   1 T. ambiguum
+ Capitula homogamous, discoid.   2 T. homogamum
3 (1) Phyllaries with narrow pale brown scarious margin; achenes tuberculate.   3 T. tetragonospermum
+ Phyllaries with white or pale brown scarious margin; achenes wrinkled   (4)
4 (3) Ray floret lamina ca. 10 × 3.5 mm; corona subentire; leaf blade 2-4 × 1-2.5 cm.   4 T. inodorum
+ Ray floret lamina ca. 4 × 1.5 mm; corona 3-toothed; leaf blade 5.5-9.5 × 2.5-3 cm.   5 T. limosum

Lower Taxa


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