Pry not finding installed gems (ruby 2.2.0, rvm)

tl;dr

Pry can't find several of my installed gems because the gems found by Gem::Specification are different than the gems found by gem list --local. The ruby versions are the same, and the path to the found and not-found gems seems to be the same.

I'm thinking that I must have some mix up with paths or ruby versions, but I can't find the culprit. Any ideas of how to untangle this?

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Details

I'm running ruby 2.2.0 using rvm on OS X Yosemite, and I'm having an issue getting pry to find several of my installed gems (in particular, pry-doc).

Here are my versions:

lee$ ruby -v 
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]

lee$ pry -v
Pry version 0.10.1 on Ruby 2.2.0

lee$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.4.6
  - RUBY VERSION: 2.2.0 (2014-12-25 patchlevel 0) [x86_64-darwin14]
  - INSTALLATION DIRECTORY: /usr/local/rvm/gems/ruby-2.2.0
  - RUBY EXECUTABLE: /usr/local/rvm/rubies/ruby-2.2.0/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/rvm/gems/ruby-2.2.0/bin
  - SPEC CACHE DIRECTORY: /Users/lee/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-14
  - GEM PATHS:
     - /usr/local/rvm/gems/ruby-2.2.0
     - /usr/local/rvm/gems/ruby-2.2.0@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gem" => "--omg"
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /usr/local/rvm/gems/ruby-2.2.0/bin
     - /usr/local/rvm/gems/ruby-2.2.0@global/bin
     - /usr/local/rvm/rubies/ruby-2.2.0/bin
     - /usr/local/rvm/bin
     - /usr/local/bin
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /usr/local/git/bin
     - /opt/sm/bin
     - /opt/sm/pkg/active/bin
     - /opt/sm/pkg/active/sbin
     - /opt/sm/bin
     - /opt/sm/pkg/active/bin
     - /opt/sm/pkg/active/sbin

Listing gems via the command line returns what I expect:

lee$ gem list --local | grep 'pry'
pry (0.10.1)
pry-doc (0.8.0)
pry-git (0.2.3)
pry-nav (0.2.4)
pry-rails (0.3.4)

And the paths for both pry and bash seem to be the same

lee$ gem which pry
/usr/local/rvm/gems/ruby-2.2.0/gems/pry-0.10.1/lib/pry.rb

lee$ gem which pry-doc
/usr/local/rvm/gems/ruby-2.2.0/gems/pry-doc-0.8.0/lib/pry-doc.rb

pry(main)> $ pry
From: /usr/local/rvm/gems/ruby-2.2.0/gems/pry-0.10.1/lib/pry/core_extensions.rb @ line 41:
... 

However, in pry, the gems available to be installed are controlled by Gem::Specification from the rubygems library. Running the following:

# I know this method is a mess, but it does the job
def prys
  Gem::Specification.sort_by{ |g| [g.name.downcase, g.version] }
    .select { |g| g.name =~ /pry/ }
    .group_by{ |g| g.name }
    .map { |name, versions| 
      "#{name} (#{versions.map { |v| v.version.to_s }.join(', ') })" 
    }
end

prys

returns:

=> ["pry (0.10.1)", "pry-rails (0.3.4)"]

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I've tried uninstalling and reinstalling as well as hunting around for another copy of the found gems, but no luck. I can't figure out the pattern for what's being returned either.

Any ideas of what to try next?