Koford 154 CynomyS ludovicianos June 24, 1955 Nr. Ft. Collins, Colo. Dunes, large & not as readily distinguished from grown as at Wind Cave, May 23, 1955 Addenda for TRIVMP, Medora, N. Dakota. Common on Johnson plateau a Lactuca, possibly ludovicianus. In Bowman Creek area, a small mustard, Descurainia sophia, common on old Cyn. lud. mdo. (period Aug. 1952), & also Mor- (lupis) nutelliana. In grazed portion, or mdo. same area, where much Ag. am. & Bo. grac., Cryptantha bracteosa common. Lepidium densiflorum common within park boundary same area, on mounts, on 10 % slope, where little grazing, also in park area, old mdo., much Sphaeralcea coccinea, Descurainia, Monolepis, Lepidium, & a subserpent Eriogonum & Chorizanthe. On Big plateau (May 22), another Lactuca (pulchella ?), common on mdo. (rootstalk, perennial). Also same place, Brom- us tectorum, grows vigorously edge C. l. mdo. (4 Bogans- myopes mdo.). Much between mdo. tops (dominant at 10' distance). In Acrey Bottom where & shot May 23, Art. frig., Sabelomandra ? (called a Poo at time), Plantago purshii, Sphaeralcea coc. June 17, 1955 Addenda . Wind Cave M.P., S. Dak. In Shirttail Canyon, main folds on mounts still being used: Proraia, Festuca octoflora, Tradescantia, Ama- other, Lygodium, Salamum, Lopopula. Some other plots present: Asclepias pumila, Echinacea angustifolia, Liatria (cut by C.L.), Plantago purshii, Festuca octoflora, Salamum Ox- alis, Sabelomandra, Calochortus (in bloom, white) & others collected. Nr. Ft. Collins, Colo. June 25, 1955 Visited Damp Colony, 55. 2 a.Ft. Collins in forenoon. Low & grown, + groups 14-5 shrubs. Soil map of