Costus aff. zamoranus - Nangaritza Form
Click on a thumbnail to open a larger image in a separate window.


Click to see R3336-01.JPG
This form of Costus aff.zamoranus was found at Reserva Maycu east of the Rio Nangaritza in the shade of primary forest areas, and in heavy sticky grey clay soil.
Click to see R3336-02.JPG
It matches the description of C. zamoranus very well but there are distinct differences from the form found in the type location on the other side of the mountains near Valladolid.
Click to see R3336-03.JPG
The bracts were always found covered with detrius that was apparently cultivated there by the omnipresent ants.
Click to see R3336-04.JPG
The foliage was tall and clearly different from the plants of Costus amazonicus which also is found in the region and also produces basal flowers.
Click to see R3336-05.JPG
All plants of this type we saw in this area were basal flowering.
Click to see R3336-06.JPG
The stems and ligules were glabrous and the ligules truncate, petioles failry long.
Click to see R3336-07.JPG
The leaves were glabrous on the upper sides....
Click to see R3336-08.JPG
and on the lower sides.
Click to see R3336-09.JPG
Before scraping away the detrius.
Click to see R3336-10.JPG
And here a clearer picture of the bracts. Note the color and the red margins, and sharply contrasting reddish nectar callus. Very different from the form found at the type location of Valladolid.
Click to see R3336-11.JPG
The covered parts of the bracts were red.
Click to see R3336-12.JPG
The flowers were more tubular in shape than C. amazonicus or C. laevis - which are the two described species that are closest to C. zamoranus.
Click to see R3336-13.JPG
The details of the flowers.
Click to see R3336-14.JPG
Another plant a bit farther down the road from the previous one.
Click to see R3336-16.JPG
Click to see R3336-17.JPG
Click to see R3336-18.JPG
Click to see R3336-19.JPG
Click to see R3336-20.JPG
Click to see R3336-21.JPG
Click to see R3336-22.JPG
Click to see RioNang-Orchideas-01.JPG
The same type of C. aff. zamoranus was found on the west side of the Rio Nangaritza near Las Orchideas in heavy shade with thick leaf mulch and the same limey soil base.
Click to see RioNang-Orchideas-02.JPG
The Las Orchideas plant is detailed in the following photos for comparison.
Click to see RioNang-Orchideas-03.JPG
Click to see RioNang-Orchideas-04.JPG
Click to see RioNang-Orchideas-05.JPG
Click to see RioNang-Orchideas-06.JPG
Click to see RioNang-Orchideas-07.JPG
Click to see RioNang-Orchideas-08.JPG
Click to see RioNang-Orchideas-09.JPG
Click to see RioNang-Orchideas-10.JPG
   
Copyright 2015 - Dave Skinner

Click on a thumbnail to open a larger image in a separate window.