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Published In: Ueber die Tanaceteen: mit besonderer Berücksichtigung der deutschen Arten 31–34. 1844. (Tanaceteen) Name publication detail
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Synonym Text: Chamaemelum Vis., Giorn. Bot. Ital. 1: 33. 1844, non Miller (1754).
General/Distribution: A difficult genus of c. 38 species, distributed mainly in Europe and temperate Asia, a few species occur in N. America and N. Africa (Bremer & Humphries, l.c. 1993). Represented in Pakistan by 3 species.
Comment/Acknowledgements: This genus, treated under Matricaria by some authors, is characterized by 3-ribbed cypselas bearing 2 abaxial resinous glands which are absent in Matricaria.

 

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Annual or perennial, ± glabrous to sparsely hairy herbs with alternate, 1-3-pinnatisect leaves. Capitula discoid, radiate or disciform, hetero- or homogamous, pedunculate, solitary or in corymbs. Involucre ± hemispherical, phyllaries 2-5-seriate, imbricate, scarious-margined. Receptacle glabrous, convex to elongate conical or hemispherical. Ray-florets female, mostly white or pale-pink, ligulate, rarely tubular or eligulate. Disc-florets bisexual, with 5-lobed corolla tube, each lobe with a reddish or sometimes brown-black gland-like resin sac at tip. Cypselas mucilaginous or not, triquetrous, oblong or obpyramidate, with single adaxial or a pair of lateral thick, sometimes thin, whitish ribs, often rugose or tuberculate anteriorely and between the ribs, 2 (-3-5), glandulose at the apices. Pappus absent or scarious coronate, crenulate or occasionally auricle 3-lobed.
 

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1 Capitula disciform, ray-florest without ligules. (2)
+ Capitula radiate, ray-florets with white ligules. 1 Tripleurospermum parviflorum
2 (1) Cypselas obpyramidate, rugose on ventral side. Pappus present, shortly coronate. 3 Tripleurospermum decipiens
+ Cypselas oblong-cylindric, ± prismatic, smooth on ventral side. Pappus absent. 2 Tripleurospermum disciforme
 
 
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