Hymenolepis, Cassini (1817: 138), Cassini, 1817

Magoswana, Simon L., Schutte-Vlok, Anne Lise, Vlok, Jan & Magee, Anthony R., 2015, Hymenolepis glabra (Anthemideae, Asteraceae), a new species from the Little Karoo (South Africa), Phytotaxa 230 (2), pp. 189-192 : 189-190

Updated key to the species (adapted from Magoswana & Magee 2014)

1. Involucral bracts glabrous ..................................................................................................................................................................2

1. Involucral bracts sericeous .................................................................................................................................................................5

2. Synflorescence a congested corymb with peduncles obscured; leaves ≤ 20 mm long ...................................................... H. dentata

2. Synflorescence an open, doubly compound corymb with visible peduncles; leaves ≥ 30 mm long .................................................3

3. Leaves linear and undivided; restricted to the Eastern Cape.............................................................................................. H. indivisa

3. Leaves variously 2- or 3-sect to pinnatisect, sometimes entire towards synflorescence; restricted to Northern and Western Cape... ............................................................................................................................................................................................................4

4. Leaves spreading, pinnatisect with 5 to 9 lobes; branches and young leaves sparsely covered in short white hairs .......................... .................................................................................................................................................................................... H. crithmifolia

4. Leaves erect or suberect, mostly 2- or 3-sect, sometimes entire towards synflorescence; all parts glabrous...................... H. glabra

5. Leaves pinnatisect ..............................................................................................................................................................................6

5. Leaves entire to apically dentate ........................................................................................................................................................7

6. Leaves densely felted, greyish-white to brownish gold,> 30 mm long, strongly pinnatisect, mostly 7- to 14-lobed......................... ........................................................................................................................................................................................... H. speciosa

6. Leaves glabrous, green, < 20 mm long, weakly pinnatisect, usually 5-lobed....................................................................... H. incisa

7. Leaves obovate-spatulate, ≥ 3 mm wide, apically 3- to 9-dentate; mature leaves densely hairy abaxially and greyish-white ........... ........................................................................................................................................................................................... H. cynopus

7. Leaves linear to elliptic, ≤ 3 mm wide, entire or some leaves apically 3- toothed; mature leaves glabrous to glabrescent and green at maturity...........................................................................................................................................................................................8

8. Pappus absent; cypsela ribs tuberculate; synflorescence a compound corymb, 20–40 mm diam.; shrublet to 0.6 m, branched from near base ................................................................................................................................................................................. H. calva

8. Pappus present; cypsela ribs smooth; synflorescence a simple corymb, 4–20 mm diam.; lanky single stemmed shrub to 2 m, branched in upper half ................................................................................................................................................... H. gnidioides