Senecio sect. Cacaliastrum, Cabrera, 1950

Teles, Aristônio Magalhães, 2018, Senecio espiritosantensis (Compositae: Senecioneae), a new species from Espírito Santo, Brazil, Phytotaxa 334 (3), pp. 297-300 : 299

Key to the species of Senecio sect. Cacaliastrum

1. Leaf blade lyrate-pinatissect ............................................................................................................................................................. 2

− Leaf blade ovate to oblong-ovate ..................................................................................................................................................... 3

2. Capitula disciform; pistillate florets with filiform corolla ......................................................................................... S. westermanii

− Capitula discoid; florets with tubular corolla ................................................................................................................... S. macrotis

3. Branches of capitulescence densely hirsute ..................................................................................................................................... 4

− Branches of capitulescence arachnoid, lanuginose or tomentose ..................................................................................................... 5

4. Petioles winged; leaf blade white-tomentose abaxially .................................................................................................. S. rossianus

− Petioles wingless; leaf blade ochraceous-tomentose abaxially ................................................................................. S. ramentaceus

5. Cypselas pubescent or shortly papillose ........................................................................................................................................... 6

− Cypselas glabrous ............................................................................................................................................................................. 7

6. Leaf blade densely arachnoid abaxially; involucral bracts 5 ............................................................................... S. espiritosantensis

− Leaf blade densely tomentose abaxially; involucral bracts 8 − 13 ..................................................................................................... 8

7. Capitula short-radiate; involucral bracts 13 − 14 ..................................................................................................... S. malacophyllus

− Capitula discoid; involucral bracts 7 − 8 ............................................................................................................................. S. grandis

8. Leaf blade abaxially densely white-tomentose; capitula always discoid; involucral bracts 13; florets 20 − 35 ................................ 9

− Leaf blade abaxially grey-tomentose; capitula discoid or radiate; involucral bracts 8; ray florets 0–4, disc florets 7 − 13 ................ ....................................................................................................................................................................................... S. arctiifolius

9. Petiole 7–10 cm long; involucre ca. 10 mm long, 8 − 10 mm in diam.; florets ca. 35; cypselas pubescent .................. S. almasensis

− Petiole 0.8–2(–4.3) cm long; involucre 6–7 mm long, 5.8 − 6.5 mm in diam.; florets ca. 20; cypselas short-pappilose ..................... .................................................................................................................................................................................... S. hatschbachii