Caryophyllaceae GH: 00037645 Cerastium arvense villosissimum Pennell USA: Pennsylvania Below Lees Mills F. W. Pennell 10767 1920-9-21
Orobanchaceae GH: 02035640 Agalinis edwardsiana Pennell USA: Texas Austin: [no additional data] F. W. Pennell 10454 1920-5-15
GH: 00056110 Castilleja citrina Pennell USA: Texas Talpa F. W. Pennell 10516 1920-5-20
GH: 01876297 Castilleja citrina Pennell USA: Texas San Angelo along Concho R. F. W. Pennell 10508 1920-5-18
GH: 01877217 Castilleja indivisa Engelmann USA: Texas Wallis F. W. Pennell 10286 1920-5-4
GH: 01877697 Castilleja lindheimeri A. Gray USA: Texas San Marcos: [no additional data] F. W. Pennell 10431 1920-5-13
GH: 01877696 Castilleja lindheimeri A. Gray USA: Texas Kerrville: [no additional data] F. W. Pennell 10364 1920-5-9
GH: 01879284 Castilleja sessiliflora Pursh USA: Texas Canyon Head of Paloduro Cañon F. W. Pennell 10542 1920-5-22
Plantaginaceae GH: 01999403 Gratiola brevifolia Rafinesque USA: Louisiana [data not captured] F. W. Pennell 10222 1920-5-1
GH: 01999581 Gratiola neglecta Torrey USA: Arkansas [data not captured] F. W. Pennell 10674 1920-5-31
GH: 02001344 Mecardonia procumbens (Miller) Small USA: Texas Harrisburg F. W. Pennell 10249 1920-5-3
GH: 02001364 Mecardonia procumbens (Miller) Small USA: Texas Houston: [no additional data] F. W. Pennell 10260 1920-5-2
GH: 02001363 Mecardonia procumbens (Miller) Small USA: Texas Fairland F. W. Pennell 10475 1920-5-17
GH: 02001774 Nuttallanthus texanus (Scheele) D. A. Sutton USA: Oklahoma Bethany F. W. Pennell 10574 1920-5-26
GH: 02002004 Penstemon albidus Nuttall USA: Texas Post F. W. Pennell 10530 1920-5-21
GH: 02001996 Penstemon albidus Nuttall USA: Texas Head of Paloduro Cañon. F. W. Pennell 10545 1920-5-22
GH: 02002016 Penstemon alluviorum Pennell USA: Kentucky [data not captured] F. W. Pennell 10701 1920-6-3
GH: 00091359 Penstemon arkansanus Pennell USA: Arkansas Ozark, sandstone and shale cliffs F. W. Pennell 10616 1920-5-29
GH: 00091360 Penstemon arkansanus Pennell USA: Arkansas Ozark, sandstone and shale cliffs F. W. Pennell 10616 1920-5-29
GH: 00091142 Penstemon arkansanus Pennell USA: Arkansas Little Rock: Pulaski Heights, shale and sand... F. W. Pennell 10640 1920-5-31
GH: 02002270 Penstemon arkansanus Pennell USA: Arkansas [data not captured] F. W. Pennell 10651 1920-5-31
GH: 00091143 Penstemon arkansanus pubescens Pennell USA: Arkansas Penters Bluff, sandstone woodland F. W. Pennell 10678 1920-6-1
GH: 02002939 Penstemon buckleyi Pennell USA: Oklahoma Hext Ranch, west of Sayre F. W. Pennell 10560 1920-5-24
GH: 02118071 Penstemon canescens (Britton) Britton USA: Kentucky [data not captured] F. W. Pennell 10720 1920-6-4
GH: 00091213 Penstemon cobaea Nuttall USA: Arkansas Penters Bluff, limestone cliff F. W. Pennell 10681 1920-6-1
GH: 02118387 Penstemon cobaea Nuttall USA: Oklahoma Weatherford F. W. Pennell 10572 1920-5-25
GH: 00091213 Penstemon cobaea purpurea Pennell USA: Arkansas Penters Bluff, limestone cliff F. W. Pennell 10681 1920-6-1
GH: 02118976 Penstemon digitalis Nuttall ex Sims USA: Arkansas [data not captured] F. W. Pennell 10633 1920-5-30
GH: 02119474 Penstemon fendleri Torrey USA: Texas Canyon F. W. Pennell 10540 1920-5-22
GH: 02119490 Penstemon fendleri Torrey USA: Texas San Angelo F. W. Pennell 10486 1920-5-18
GH: 02119484 Penstemon fendleri Torrey USA: Texas Tulia F. W. Pennell 10538 1920-5-21
GH: 02120819 Penstemon laxiflorus Pennell USA: Arkansas [data not captured] F. W. Pennell 10658 1920-5-31
GH: 02120835 Penstemon laxiflorus Pennell USA: Oklahoma Bethany F. W. Pennell 10576 1920-5-26
GH: 02120832 Penstemon laxiflorus Pennell USA: Louisiana [data not captured] F. W. Pennell 10206 1920-4-30
GH: 00091359 Penstemon multicaulis Pennell USA: Arkansas Ozark, sandstone and shale cliffs F. W. Pennell 10616 1920-5-29
GH: 00091360 Penstemon multicaulis Pennell USA: Arkansas Ozark, sandstone and shale cliffs F. W. Pennell 10616 1920-5-29
GH: 00091143 Penstemon pallidus Small USA: Arkansas Penters Bluff, sandstone woodland F. W. Pennell 10678 1920-6-1
GH: 02122910 Penstemon tenuis Small USA: Louisiana [data not captured] F. W. Pennell 10186 1920-4-30
GH: 02122904 Penstemon tenuis Small USA: Arkansas [data not captured] F. W. Pennell 10699 1920-6-1
GH: 02122982 Penstemon triflorus A. Heller USA: Texas Talpa F. W. Pennell 10515 1920-4-20
GH: 02122971 Penstemon triflorus A. Heller USA: Texas Kerrville: [no additional data] F. W. Pennell 10377 1920-5-9
GH: 02122987 Penstemon triflorus integrifolius (Pennell) Cory USA: Texas San Angelo F. W. Pennell 10500 1920-5-18
GH: 01801046 Penstemon tubaeflorus Nuttall USA: Arkansas [data not captured] F. W. Pennell 10643 1920-5-31
GH: 01801033 Penstemon tubaeflorus Nuttall USA: Arkansas [data not captured] F. W. Pennell 10628 1920-5-30
GH: 01801079 Penstemon tubaeflorus Nuttall USA: Oklahoma west of McAlester F. W. Pennell 10595 1920-5-27
GH: 01811265 Veronica peregrina xalapensis (Kunth) Pennell USA: Texas Kerrville: [no additional data] F. W. Pennell 10391 1920-5-9
Pucciniaceae FH: 00996165 Puccinia andropogonis Schweinitz USA: Arkansas Jefferson Springs F. W. Pennell 10658 1920-5-31
Scrophulariaceae GH: 01842000 Erythranthe inamoena (Greene) G. L. Nesom USA: Texas Granite Mountain F. W. Pennell 10459 1920-5-17
