Earth & Environmental Sciences
cactus
100%
pollination
88%
reproductive strategy
73%
desert
56%
pollinator
54%
pollen limitation
51%
seed set
46%
outcrossing
44%
pollen
37%
fruit set
24%
autogamy
21%
bee
16%
morphometry
16%
ecological factor
15%
distribution
14%
environmental factor
11%
experiment
10%
ecology
10%
habitat
8%
index
6%
Agriculture & Biology
Chihuahuan Desert
97%
pollination
60%
pollen
53%
reproductive system
46%
mating systems
43%
pollinators
42%
Opuntia
35%
outcrossing
30%
seed set
29%
flowers
28%
Diadasia
26%
Lasioglossum
21%
Cactaceae
17%
environmental factors
17%
population ecology
17%
floral characteristics
16%
morphometry
15%
selfing
14%
fruit set
14%
deserts
13%
bees
12%
flowering
9%
breeding
8%
habitats
7%