Guatteria

Couvreur, T. L. P., Cornejo, X., Zapata, J. N. & Loor, A., 2022, Two new magnoliid (Annonaceae, Lauraceae) tree species from Manabí, western Ecuador, Blumea 67 (2), pp. 97-108 : 104

Key to the western Ecuadorian species of Guatteria (except for G. punctata )

1. Plants with cauliflorous inflorescences. — A mainly Amazonian species with a single known collection from Carchi .................................... G. scalarinervia

1. Plants with ramiflorous inflorescences (never cauliflorous). .. ... ... ... ... .. ... ... ... ... ... ... ... ... .... 2

2. Leaves densely to sparely and uniformly verruculose on lower side (small lumps visible with a hand lens)...... 3

2. Leaves not verruculose all over on lower side (or only very sparsely so and then localized).................... 6

3. Young and older branches totally covered with erect to appressed 2–3 mm long brown to greyish hairs........................................... G. cuatrecasasii

3. Young branches densely to sparsely covered with appressed 1 mm long hairs (but not totally covering the branches), old branches glabrous.............................. 4

4. Leaf blades 4–6 times longer than wide, margins not revolute, petioles 1–3 mm long; flowering pedicels thin (c. 1 mm diam) and 35–45 mm long. — Lowland rain forests........................................ G. narinensis 4. Leaf blades less than 4 times longer than wide, margins revolute, petioles 8–25 mm long; flowering pedicels robust (c. 2 mm diam) and 10–35 mm long. — Premontane or montane forests............................... 5

5. Secondary veins 25–35 per side........... G. venosa

5. Secondary veins 14–20 per side......... G. crassipes

6. Leaf bases obtuse or acute and petioles shorter than 6 mm ............................................ 7

6. Leaf bases attenuate or long attenuate or if acute or obtuse then petioles longer than 6 mm ................... 9

7. Leaves coriaceous;flowering pedicels 15–20mm long;monocarps 14–16 mm long; 1450–2050 m altitude........................................... G. carchiana

7. Leaves membraceous; flowering pedicels 20–55 mm long; monocarps 8–10 (but unknown in G. brevipetiolata ); below 1000 m altitude............................... 8

8. Secondary veins raised above....... G. brevipetiolata

8. Secondary veins impressed above...... G. microcarpa

9. Petioles 2–4 mm long, secondary veins 10–12 per side; outer petals 7–9 mm long. — In forests fragments near the coast in Esmeraldas ................ G. esmeraldae

9. Petioles longer than 4 mm, secondary veins more than 12 per side; outer petals longer than 9 mm. — Not near the coast in Esmeraldas .......................... 10

10. Leaf bases long attenuate, narrowed basal part of leaves longer than 15 mm ...................... G. pittieri

10. Leaf bases acute, and, if attenuate, narrowed basal part of leaves generally shorter than 15 mm ........... 11

11. Petioles 7–17 mm long; flowering pedicels 25–80 mm long.............................. G. pichinchae

11. Petioles 4–8 mm long; flowering pedicels generally shorter than 25 mm ................................. 12

12. Young branches not zigzagging, leaves chartaceous, margins not revolute, secondary veins 16–19, basal margins of leaf blades not revolute. — In lowland rain forest, between 200–350 m ....................... G. esperanzae

12. Young branches often zigzagging, leaves coriaceous, margins revolute, secondary veins 10–16, basal margins of leaf blades often revolute. — In montane forests between 980–3000 m ....................... G. goudotiana