1. Blades mostly less than 10 cm long, petioles relatively long (2 cm) ... 2

2. Blades of canopy leaves mostly less than 4 cm wide, shiny and smooth above, totally glabrous, blade brown when dry, Pacific slope moist forest below 1100 m ... Cinnamomum brenesii

2. Blades of canopy leaves commonly 5-7 cm wide, dull green above, blades often with minute erect pubescence below when young, blade gray-green above and yellow-green below when dry, Pacific slope above 1200 m ... Cinnamomum tonduzii (was neurophyllum)

1. Blades commonly more than 10 cm long, petioles often shorter, mostly above 1200 m on Pacific slope ... 3

3. Leaves shiny green below, lacking a dull whitish cast, pubescent domatia well-developed in axils of basal veins, finest tertiary vein reticulations course and dull (seen against the light), leaves drying dark brown above and below, lower Monteverde to Los Llanos ... Cinnamomum costaricana, cf.

3. Leaves with a dull whitish cast below, pubescent domatia present or not, tertiary veins forming fine yellow reticulations (seen against the light) ... 4

4. Blades broad, commonly more than 6 cm wide, underside with minute short erect pubescence, petioles not red even on young leaves, blade apex rounded to short-pointed, leaves of saplings bullate, leaves drying dull gray-green to yellow-green ... Cinnamomum tonduzii (was neurophyllum)

4. Blades narrow, rarely more than 5 cm wide, glabrous below except when very young, petioles and young twigs often reddish, blade apex with a long drip tip, leaves of saplings not bullate ... 5

5. Basal lateral veins with pubescent domatia in the axils, corresponding small bumps on upperside, blade base rounded to acute and distinct from petiole, basal lateral veins curved near base, petioles slender and red only in newly flushing leaves, blades generally narrow, especially on suckers, lower Monteverde to Los Llanos ... Cinnamomum triplinerve (was cinnamomifolia)

5. Domatia rare or absent, blade base acute and often extending along petiole, basal lateral veins nearly straight, petioles stout and often red, blades not noticeably narrow, upper Monteverde and Santa Elena ... Cinnamomum paratriplinerve