Tribe 11. TAGETEAE 



Per Axel Rydberg 



Plants with usually conspicuous oil-glands in the foliage, strong-scented. 

 Heads radiate or discoid. Ray-flowers when present pistillate; corollas in 

 all our genera ligulate and deciduous. Disk-flowers hermaphrodite and 

 fertile, with actinomorphic, usually 5-lobed corollas. Involucral bracts in 

 one or two subequal series, either distinct or more or less united into a cup 

 or tube, more or less dotted or striped with conspicuous oil-glands, not rarely 

 subtended by some loose accessory bracts (ealyculum). Receptacle naked, 

 puberulent, or even fimbrillate (Clomcnocoma). Achenes narrow and striate. 

 Pappus various, of either squamellae or bristles, or both. 



Style-branches of the hermaphrodite flowers elongate, appendiculate or 

 truncate; leaves, if simple, not bristly-ciliate at the base. 



Style-branches of the hermaphrodite flowers short, oblong; leaves simple, 

 usually bristly-ciliate, at least towards the base. 



Subtribe 1. Tagetanak. 

 Subtribe 2. Pkctidanae. 



Subtribe 1. TAGETANAE. Pleads radiate or discoid. Involucre with 

 or without a ealyculum; bracts not conspicuously carinate. Disk-corollas 

 with a narrow tube usually gradually and indistinctly passing into the sub- 

 cylindric or trumpet-shaped throat. Leaves simple or pinnate, not bristly- 

 ciliate at the base, though in some species of Tagetes and in Lebetina the teeth 

 are bristle-tipped. Style-branches of the hermaphrodite flowers long, apendi- 

 culate or truncate, recurved. 



Pappus at least partly 7 squamellate. 



Squamellae reduced to a merely 5-toothed ring. 

 Squamellae usually well developed. 

 Pappus of squamellae only. 



Squamellae few, 3-10, unequal, some of them, usually 1 or 2 

 longer, linear or subulate, acute, the rest broader, shorter, 

 usually obtuse; involucre cylindric or fusiform; bracts united 

 to near the apex. 

 Squamellae 10-20, rarely less, all or the alternating ones equal. 

 Squamellae dissected into 5-12 (in Aciphyllaea the alter- 

 nating ones with only 3) bristles. 

 Heads conglomerate into heads of a secondary order, 

 only the marginal heads radiate on the peripheral side. 

 Heads not conglomerate into heads of a secondary order, 

 all radiate or all discoid. 

 Calyculum wanting or represented by 1-3 (in one 

 species of Gymnolaena more numerous) linear 

 or lanceolate inconspicuous accessory bracts. 

 Involucre subcylindric or urceolate; bracts in a 



single series, united to near the apex. 

 Involucre hemispheric or broadly campanulate; 

 bracts in 2 series, united at the base. 

 Calyculum present, consisting of several rather con- 

 spicuous accessory bracts. 

 Principal bracts with horned glands near the 

 apex; accessory bracts pectinate'.y divided; 

 style-branches abruptly short- and slender- 

 appendaged from an obtuse subpenicillate tip. 

 Principal bracts with hornless glands; accessory 

 bracts not pectinate. 

 Bracts united only at the base; squamellae 

 usually with more than 5 bristles each. 

 Style-branches with subulate appendages; 

 receptacle fimbrillate; accessory bracts 

 rarely more than half as long as the 

 involucre proper. 



Volume 34, Part 2, 1915] 



1. Adenopappus. 



2. Tagetes. 



3. Syncephalantha. 



4. Gyjinolaena. 



5. Boeberastrum. 



6. Lebetina. 



Clomenocoma. 

 147 



