Rubus lentianus and similar species (Hook. & Arn.) Focke, 1877

Lepší, Martin, Lepší, Petr, Hohla, Michael & Király, Gergely, 2023, Rubus lentianus, a new species from Austria and Germany-another piece of the puzzle from a European hotspot of Rubus series Radula, Phytotaxa 594 (1), pp. 43-52 : 50-51

Key to the identification of Rubus lentianus and similar species

1. Indentation on terminal leaflet of primocane leaves regular, crenate-serrate....................................................................................2.

- Indentation on terminal leaflet of primocane leaves periodical, serrate............................................................................................3.

2. Prickles 3–10 per 5 cm of primocane length, 3–4(–5) mm long; apex of terminal leaflet of primocane leaves 5(–8) mm long ........ .................................................................................................................................................................................. R. salisburgensis

- Prickles (19–)24–29(–34) per 5 cm of primocane length, (6.5–)7–8(–8.5) mm long; apex of terminal leaflet of primocane leaves (12–)15–17(–21) mm long ............................................................................................................................................ R. perpungens

3. Terminal leaflet of primocane leaves with incisions (2.5–)4.0–5.0(–6.0) mm deep, apex of terminal leaflet (16–)21–23(–26) mm long.................................................................................................................................................................................... R. lentianus

- Terminal leaflet of primocane leaves with incisions 1–4 mm deep, apex of terminal leaflet 10–20(–25) mm long ........................4.

4. Primocane with 150–280 hairs, 40–120 stalked glands per 1 cm of stem side and very slender prickles, colour of leaves beneath noticeably variable along the length of the primocane, green at the base and white-greyish at the top ............... R. silvae-bavaricae

- Primocane with fewer hairs (8–250) or fewer stalked glands (1–140) per 1 cm of stem side and with thicker prickles, colour of leaves beneath less variable along the length of the primocane........................................................................................................5.

5. Primocanes with transitions between stalked glands and prickles, i.e. unequal stalked glands, acicles, bristles and sometimes also pricklets present; leaves distinctly hairy to the touch beneath and hairy or glabrous above.............................................................6.

- Primocanes usually without transitions between stalked glands and prickles, stalked glands usually short; leaves usually not distinctly hairy to the touch beneath (except for R. muhelicus , see 9) and glabrous above ..............................................................8.

6. Primocanes sharply angled with (30–)40–100(–250) hairs per 1 cm of stem side and with prickles ± patent, straight; pedicels with stalked glands longer than the longest simple hairs; leaves usually with scattered hairs above ........................... R. jarae-cimrmanii

- Primocanes angled or bluntly angled with 3–20 hairs per 1 cm of stem side and with prickles declining, often slightly curved; pedicels with stalked glands shorter than the longest simple hairs; leaves glabrous or almost glabrous above ...............................7.

7. Primocane leaves (very) distinctly pedate, with an ovate or obovate terminal leaflet abruptly narrowing into a (15–)20(–25) mm long apex, with a slightly cordate (rarely rounded) base and with distinctly periodical indentation; petals pale pink........................ ....................................................................................................................................................................................... R. perpedatus

- Primocane leaves not distinctly pedate, with a broadly ovate to broadly obovate terminal leaflet abruptly narrowing into a 10–15(– 20) mm long apex, with a distinctly cordate base and with slightly periodical indentation; petals white ........................ R. epipsilos

8. Primocane leaves 3–4(–5)-foliolate, terminal leaflet oblong obovate to broadly obovate; primocanes bluntly angled; carpels densely hairy; petals white to slightly pinkish ................................................................................................................ R. vatavensis

- Primocane leaves (3–)5-foliolate, terminal leaflet of a different shape; primocanes angled to sharply angled; carpels glabrous or with few hairs; petals pale pink to pink.............................................................................................................................................9.

9. Primocane leaves ± palmate, terminal leaflet broadly ovate to round with a distinctly undulating margin; prickles (9–)11–20(–22) per 5 cm of primocane length.......................................................................................................................................... R. muhelicus

- Primocane leaves distinctly pedate, terminal leaflet elliptical to broadly elliptical, ovate or rhombic with a rather flat margin; prickles 5–12(–16) per 5 cm of primocane length...........................................................................................................................10.

10. Pedicels with stalked glands shorter than long simple hairs; primocanes sparsely to intermediately densely hairy, with slightly declining prickles; prickles on inflorescence rachis 7–8 mm long; inflorescence conical, its branches rather thick ........... R. radula

- Pedicels with stalked glands as long as short simple hairs; primocanes glabrous or with very few hairs, with distinctly declining prickles; prickles on the inflorescence rachis 3–4 mm long; inflorescence broadly conical, diffuse, with rather thin branches .... R. rudis