1.

+

Densely hairy herbs. Anthers polliniferous.

2

–

Glabrous herbs. Anthers not polliniferous.

3

2.

+

Outer phyllaries ovate, 10 – 12  mm long; cypsela 5.5 – 6  mm long, beak of the cypsela 0.5 – 1.0  mm long.

78. T. brevirostre

Outer phyllaries lanceolate, 3 – 4  mm long; cypsela c. 5 mm long,  beak of the cypsela 1.2 – 1.8  mm long.

79. T. erioscapum

3.

+

Phyllaries black, the longest outer ones and the inner ones almost equal. Cypsela not papillose.

81. T. zamarrudae

–

Phyllaries brownish-green, the longest outer ones at least half the length of the inner ones. Cypsela papillose above.

 80. T. mansehracum