Tullia pycnanthemoides, xx, 343.f
Ulmus crassifolia, xlix, 129.
— racemosa, xix, 170.f
Usnea acharius, from N. South Shetlands, vi, 104.f
Utricularia intermedia, xlv, 28.
— nelumbiifolia, xlv, 215.
— striata, xlv, 29.
Uvularia lanceolata, xi, 178.
— perfoliata, iv, 61.
Vaccinium hirsutum, xlv, 175.