Calomystrium subsect. Rupicola

Martel, Carlos & Croat, Thomas B., 2023, A new Species of Anthurium section Calomystrium, subsection Rupicola (Araceae) from Peru, Phytotaxa 585 (3), pp. 225-232 : 230-231

Key to species of sect. Calomystrium subsect. Rupicola

1. Leaves with a single midrib, either lacking a pair of basal veins or with a single pair of basal veins (one on either side of the midrib) promptly merging with the margin....................................................................................................................................................2.

- Leaves with 3 to 9 veins (including the midrib) at the base of the leaf blade and with one or more pairs of basal veins extending all the way to the apex ............................................................................................................................................................................5.

2. Spathe broadly ovate, flamingo-orange; spadix orange ................................................................................. A. vanderknaapii Croat

- Spathe lanceolate or elliptic, usually green, sometimes white or lavender-purple; spadix purplish, whitish or greenish ................3.

3. Leaf blades more than 30 cm long, broadest well above the middle; collective veins arising from just above the base; tertiary veins not prominulous; Colombia, Antioquia, ca. 200 m ................................................................................................. A. callejasii Croat

- Leaf blades less than 22 cm long, broadest at about the middle; collective veins arising from one of the primary lateral veins in the middle or lower third of the blade; tertiary veins prominulous; Central Panama and NE Ecuador, 200–550 m ..............................4.

4. Spadix green; berries early emergent, tapered and pointed at the apex, initially obovoid and green, maturing red-orange; fibres of weathered cataphylls eventually falling; Central Panama, 200–400 m ..................................................................... A. sytsmae Croat

- Spadix yellow; berries emerging mature, globose and purple; fibres of weathered cataphylls very persistent; NE Ecuador, 500–550 m .................................................................................................................................................................................. A. werffii Croat

5. Leaves rhombic or ovate-rhombic, broadest well below the middle; 7–11 veins at the base of leaf blade (3–5 basal veins per side) or with basal veins lacking; spadix white..........................................................................................................................................6.

- Leaves lanceolate or elliptic; 3 veins at the base of leaf blade (midrib and a single pair of basal veins); spadix white or lavender7.

6. Leaf blades rhombic, drying subcoriaceous, dark brown on upper surface; spathe white; Colombia, slopes of western Andes in Valle Department, 0–250 m ............................................................................................................................ A. antrophyoides Killip

- Leaf blades ovate-rhombic, drying moderately thin, greenish to greyish yellow-brown on the upper surface (if the weak submarginal veins are included); spathe green; Ecuador, slopes of eastern Andes in Napo Department , 1800 m ............... A. palacioanum Croat

7. Primary lateral veins numerous (more than 10 per side), sometimes not distinguishable from interprimary veins; cataphylls weathering into persistent fibres; spathe green; spadix white at anthesis ............................................................. A. chocoense Croat

- Primary lateral veins 3–5 pairs per side, distinguishable from interprimary veins; cataphylls deciduous with only their papery bases remaining or persistent and intact, never fibrous; spathe white to lavender; spadix dark violet-purple, lavender-purple, yellowish or pink at anthesis..............................................................................................................................................................................8.

8. Epiphytic plants from Central Peru; spathe white (weakly tinged with lavender) or light lavender, ovate; spadix lavender-violet; scent spicy with honey notes ................................................................................................................. A. huaytae Croat & C.Martel

- Epipetric plants from Panama or Colombia; spathe white to purplish violet, lanceolate or ovate; spadix lavender or dark violetpurple; scent spicy or mint-scented ...................................................................................................................................................9.

9. Spathe ovate, lavender to purplish violet; spadix dark violet-purple; flower scent spicy, but not smelling of mint; berries almost purple; stems 4–6 mm diam.; cataphylls 4–5 cm long, soon deciduous, only their papery bases remaining; Central Panama, Coclé Province .............................................................................................................................................................. A. amnicola Dressler

- Spathe lanceolate, usually white, rarely lavender; spadix lavender; flower scent minty; berries green or white; stems 12–15 mm diam.; cataphylls 5–11 cm long, persisting intact, drying reddish brown; north-western region of Colombia................................... ......................................................................................................................................................................... A. antioquiense Engler