Acanthaceae A: 00424476 Beloperone californica Bentham USA: California two miles east of Shaver's Well, Colorado De... J. T. Howell 3306 1928-1-30
A: 00424476 Justicia californica (Bentham) D. N. Gibson USA: California two miles east of Shaver's Well, Colorado De... J. T. Howell 3306 1928-1-30
Anacardiaceae A: 00347330 Rhus trilobata anisophylla (Greene) Jepson USA: California Quail Springs, Morongo Mts., San Bernardino ... J. T. Howell 3399 1928-3-10
Asteraceae GH: 00386578 Brickellia oblongifolia linifolia B. L. Robinson USA: California Suprise Canyon, Panamint Mts. J. T. Howell 3913 1928-6-14
GH: 02021217 Cirsium mohavense (Greene) Petrak USA: California [data not captured] J. T. Howell 4043 1928-6-20
A: 00414488 Encelia frutescens (A. Gray) A. Gray USA: California Near Palm Wash, w. Colorado Desert J. T. Howell 3511 1928-3-24
GH: 00414041 Lessingia tenuis (A. Gray) Coville USA: California near Cuddy's Ranch, Mt. Pinos region J. T. Howell 3859 1928-5-27
GH: 00427275 Perityle megalocephala oligophylla A. M. Powell USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3906 1928-6-14
Brassicaceae GH: 00946798 Boechera perennans (S. Watson) W. A. Weber USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3903 1928-6-14
Caesalpiniaceae A: 00366096 Cercidium floridum Bentham ex A. Gray USA: California Painted Canyon, Colorado Desert J. T. Howell 3547 1928-3-25
Chenopodiaceae GH: 00376396 Atriplex hymenelytra (Torrey) S. Watson USA: California Thousand Palms, Colorado Desert J. T. Howell 3289 1928-1-28
Crossosomataceae A: 00347402 Crossosoma bigelovii S. Watson USA: California Morongo Canyon, n. Colorado Desert J. T. Howell 3414 1928-3-11
Ephedraceae A: 00356543 Ephedra californica S. Watson USA: California East end of Morongo Valley J. T. Howell 3409 1928-3-11
GH: 00356678 Ephedra viridis Coville USA: California Frazier Mountain Park, Mt. Pinos region J. T. Howell 3824 1928-5-25
Fabaceae GH: 01963300 Acmispon dendroideus (Greene) Brouillet USA: California Anacapa Island J. T. Howell 3804 1928-5-19
GH: 00366268 Astragalus crotalariae Bentham USA: California Indio, Colorado Desert J. T. Howell 3549 1928-3-25
GH: 02049264 Astragalus mohavensis S. Watson USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3920 1928-6-14
GH: 02049872 Astragalus panamintensis E. Sheldon USA: California Surprise Canyon, Panamint Mts. J. T. Howell 4006 1928-6-17
GH: 00369078 Lupinus magnificus M. E. Jones USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3893 1928-6-14
A: 02134044 Psorothamnus schottii (Torrey) Barneby USA: California [data not captured] J. T. Howell 3548 1928-3-25
Garryaceae A: 00401946 Garrya veatchii Kellogg USA: California Trail between Haines Canyon and Mt. Lukens, ... J. T. Howell 3342 1928-2-11
GH: 00401975 Garrya veatchii Kellogg USA: California Trail to Switzer's Arroyo Seco, San Gabriel ... J. T. Howell 3350 1928-2-18
Hydrophyllaceae GH: 00401061 Phacelia ramosissima Douglas ex Lehmann USA: California Point Mugu J. T. Howell 3759 1928-4-22
GH: 00401062 Phacelia ramosissima Douglas ex Lehmann USA: California Monrovia Canyon, San Gabriel Mts. J. T. Howell 3869 1928-6-10
GH: 00401063 Phacelia ramosissima Douglas ex Lehmann USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3894 1928-6-14
Malvaceae A: 00420939 Sphaeralcea ambigua A. Gray USA: California Painted Canyon, Colorado Desert J. T. Howell 3528 1928-3-24
Oleaceae A: 00401259 Fraxinus macropetala Eastwood USA: California Upper Surprise Canyon, Panamint Mts. J. T. Howell 3932 1928-6-15
Orobanchaceae GH: 01876525 Castilleja clokeyi Pennell USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3899 1928-6-14
GH: 01877483 Castilleja linariaefolia Bentham USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3993 1928-6-17
Pinaceae A: 00246801 Pinus flexilis James USA: California Summit ridge of Mt. Pinos J. T. Howell 3854 1928-5-26
Polemoniaceae GH: 01105210 Leptosiphon chrysanthus J. M. Porter & R. Patterson USA: California [data not captured] J. T. Howell 3822 1928-5-25
Polygonaceae GH: 00036091 Chorizanthe staticoides Bentham USA: California Monrovia Canyon, San Gabriel Mountains J. T. Howell 3876 1928-6-10
GH: 00036091 Chorizanthe staticoides brevispina Goodman USA: California Monrovia Canyon, San Gabriel Mountains J. T. Howell 3876 1928-6-10
GH: 01966339 Eriogonum rixfordii S. Stokes USA: California [data not captured] J. T. Howell 4063 1928-6-20
Portulacaceae GH: 00376960 Calandrinia breweri S. Watson USA: California Vermont Canyon, Griffith Park J. T. Howell 3466 1928-3-20
Pucciniaceae FH: 00950162 Puccinia distorta Holway USA: California Painted Canyon, Colorado Desert, Calif. J. T. Howell 1928-1-29
FH: 00955070 Puccinia giliae Harkness USA: California Head San Juan Canyon, Elsinore Mts. J. T. Howell 1928-7-9
FH: 01131915 Puccinia oenotherae Vize USA: California Seminole Hot Springs, Santa Monica Mountains J. T. Howell 1928-6-29
FH: 01131926 Puccinia oenotherae Vize USA: California Santa Ana Canyon J. T. Howell 1928-4-7
FH: 00949401 Puccinia rubigo-vera apocrypta (Ellis & Tracy) Arthur USA: California Santa Ana Canyon J. T. Howell 1928-2-26
FH: 00783668 Uromyces proeminens (de Candolle) Léveillé USA: California Santa Ana Canyon J. T. Howell 1928-9-22
Rhamnaceae A: 01789379 Ceanothus crassifolius Torrey USA: California Trail to Santa Anita Canyon, San Gabriel Mts... J. T. Howell 3325 1928-2-9
GH: 00349365 Ceanothus greggii A. Gray USA: California Suprise Canyon, Panamint Mts. J. T. Howell 3937A 1928-6-15
A: 00425288 Ceanothus sorediatus Hooker & Arnott USA: California Los Angeles: Cañon bottom, Vermont Cañon, ... J. T. Howell 3369 1928-3-2
A: 00425319 Ceanothus spinosus Nuttall USA: California Santa Monica Mts., near Santa Monica J. T. Howell 3375 1928-3-4
Rubiaceae GH: 00385706 Galium angustifolium Nuttall ex A. Gray USA: California Anacapa Island J. T. Howell 3792 1928-5-19
Rutaceae A: 00376005 Thamnosma montana Torrey & Fremont USA: California Mission Creek Wash, Colorado Desert J. T. Howell 3322 1928-1-31
Saxifragaceae A: 00380219 Ribes indecorum Eastwood USA: California Trail to Switzer's, Arroyo Seco, San Gabriel... J. T. Howell 3349 1928-2-18
A: 00380387 Ribes malvaceum viridifolium Abrams USA: California Trail to Santa Anita Canyon, San Gabriel Mts... J. T. Howell 3336 1928-2-9
A: 00380219 Ribes malvaceum indecorum (Eastwood) Janczewski USA: California Trail to Switzer's, Arroyo Seco, San Gabriel... J. T. Howell 3349 1928-2-18
A: 00380442 Ribes menziesii Pursh USA: California Santa Anita Canyon trail, San Gabriel Mts. J. T. Howell 3326 1928-2-9
A: 00380936 Ribes speciosum Pursh USA: California Los Angeles: Vermont Canyon, Griffith Park J. T. Howell 3363 1928-3-2
Selaginellaceae GH: 00424488 Selaginella leucobryoides Maxon USA: California Surprise Canyon, Panamint Mts. J. T. Howell 3989 1928-6-16
Solanaceae GH: 00402544 Lycium andersonii A. Gray USA: California 5 miles e. of Bradbury Well, Black Mts. J. T. Howell 3657 1928-4-2
