Siphocampylus, Pohl

Coelho, Guilherme Peres, Iganci, João Ricardo Vieira & Miotto, Silvia Teresinha Sfoggia, 2022, Siphocampylus flavescens (Campanulaceae, Lobelioideae), a New Endangered Species from Southeastern Brazil, Systematic Botany (Basel, Switzerland) 47 (2), pp. 562-566 : 563

KEY TO DISTINGUISH THE SPECIES OF SIPHOCAMPYLUS IN MINAS GERAIS, BRAZIL

1. Phyllotaxy whorled, rarely opposite.................................................................................................... 2

1. Phyllotaxy alternate, rarely pseudowhorled at apex of branches........................................................................... 5

2. Monocarpic plants; stem erect, not branched, with five or more leaves per node; inferior lobe of corolla free from the apex to near base............................................................................................................... S. sulfureus

2. Polycarpic plants; stem decumbent to sub-erect, branched, with (2–)3(–4) leaves per node; inferior lobe of corolla free only at the apex....... 3

3. Plants entirely glabrous........................................................................................... S. psilophyllus

3. Plants tomentose, especially in the veins of abaxial surface of leaves and peduncles................................................ 4

4. Stem sub-erect, poorly branched, leaves lanceolate; corolla bicolor, tube red, with lobes yellow to greenish.............. S. westinianus

4. Stem decumbent, very branched, leaves ovate to widely ovate; corolla unicolor, entirely yellow......................... S. flavescens

5. Hypanthium hemispheric......................................................................................................... 6

5. Hypanthium obconic............................................................................................................. 9

6. Corolla tube near the same size of the lobes, greenish; corolla lobes falcate; anthers strongly curvate, with a dense golden-yellowish tomentum........................................................................................................ S. umbellatus

6. Corolla tube at least five times longer than the lobes, red to orange; corolla lobes triangular; anthers slightly curvate, glabrescent or with a sparse white tomentum..................................................................................................... 7

7. Leaves coriaceous, shiny on the adaxial surface; calyx lobes deflexed.................................................... S. nitidus

7. Leaves membranaceous, dull on the adaxial surface; calyx lobes erect to sub-erect................................................ 8

8. Leaves, at least in the adaxial face, glabrescent; leaf margin unequally dentate; flowers grouped at the apex of branches, with a cor-ymbiform aspect............................................................................................ S. corymbifer

8. Leaves tomentose; leaf margin repand-denticulate to crenate-denticulate; flowers not grouped at the apex of branches, not corymbiform........................................................................................... S. macropodus

9. Stem woody, erect; leaves sessile or with short petioles up to 0.5 cm; floral peduncles equaling or smaller than leaves........ S. imbricatus

9. Stem herbaceous, decumbent to sub-lianescent; leaves with petioles longer than 1 cm; floral peduncles longer than leaves............ 10

10. Plants densely tomentose........................................................................................ S. viscidus

10. Plants glabrescent..................................................................................................... 11

11. Phyllotaxis alternate, pseudowhorled at the apex of branches; leaves sessile to subsessile, blades linear to narrowly elliptic; leaf base acute, margin crenulate to repand, with callose teeth; flowers often grouped in the apex of branches....... S. lycioides

11. Phyllotaxis alternate in the entire branch; leaves distinctly petiolate, blades lanceolate; leaf base acute to obtuse, margin unequally denticulate, without callose teeth; flowers not grouped in the apex of branches................ S. longipedunculatus