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1,100,502 specimens across 6 departments, collected since 1754 — 100,256 names, 42,336 type specimens.
Polypodium glycyrrhiza
BISH 106074
Howell, T.J.; Guttenberg, G., 1880
Western Oregon
Physematium oreganum
BISH 108315
Howell, T.J.?, 1880
Eastern Oregon
Selaginella douglasii
BISH 766464
Howell, T.J., 1880
Selaginella douglasii
BISH 768490
Howell, T.J., 1881
Columbia River, near the Cascades
Struthiopteris spicant
BISH 99027
Howell, T.J., 1880
Western Oregon
Cryptogramma acrostichoides
BISH 99287
Howell, J.; Guttenberg, G., 1886
Western Oregon.
Microtrombicula tanzaniaeType
BPBM 12147 · Howell, K.M.
Whartonia novemsetosaType
BPBM 12148 · Howell & Mainoya
ChiroptellaType
BPBM 12709 · Howell, K.M.
Schoutedenichia tanzaniaensisType
BPBM 12770 · Howell, K.M.
Schoutedenichia discalisType
BPBM 12771 · Howell, K.M.
Hesperocnide tenella
BISH 185965 · Howell, J.T., 1957
Near the Pinnacles
Brachytrichia quoyi
BISH 550422 · Howell, 1932
Floreana (=Charles Island), Ecuador
Brachytrichia quoyi
BISH 550423 · Howell, 1932
Costa Rica
Pomacea canaliculata
BPBM 263709 · Robert G. Howells; Robert G. Howells, 2000
Texas
Apus
BPBM 5191 · Lt. Howell
Oʻahu
Haemorhous mexicanus
BPBM 4896 · A B Howell
Haemorhous mexicanus
BPBM 4897 · A B Howell
Haemorhous mexicanus
BPBM 4898 · A B Howell
Haemorhous mexicanus
BPBM 4899 · A B Howell