1. Bolus L. (1914–28) Novitates Africanae. ABH 1: 17 (1914), 129, 190–191 (1915); 2: 28–31 (1916); 3: 4–6 (1920); 71–72 (1921); 123–139 (1922), 159–172 (1923); 4: 1–35 (1925); 37–42 (1926); 72–109 (1927); 126–130 (1928)
2. Bolus L. (1928) Novitates Africanae. JB 66: 9–16, 126, 195–200, 229–233
3. Bolus L. (1928–1935) Notes on Mesembrianthemum and allied genera. NM2: 1–508. 1–16 (9.11.1928), 17–32 (21.12.1928), 33–48 (24.1.1929), 49–64 (12.4.1929), 65–80 (3.5.1929), 81–94 (6.6.1929), 95–110 (4.7.1929), 111–129 (16.8.1929), 130–146 (4.11.1929), 147–160 (22.11.1929: the last two texts end in the middle of a description), 161–176 (20.2.1930), 177–192 (9.5.1930), 193–208 (15.8.1930), 209–224 (12.11.1930), 225–244 (12.2.1931), 245–268 (1.5.1931), 269–292 (3.7.1931), 293–308 (24.9.1931), 309–336 (29.1.1932), 337–356 (24.6.1932), 357–376 (5.12.1932), 377–396 (19.5.1933), 397–416 (16.10.1933), 417–436 (26.1.1934), 437–452 (23.5.1934), 453–472 (17.8.1934), 473–508 (11.2.1935). 517–520 Corrigenda. University of Cape Town. Bolus Herbarium. Cape Town
4. Bolus L. (1936–1958) Notes on Mesembryanthemum and allied genera. NM3: 1–19 (5.2.1936), 21–44 (31.7.1936), 45–78 (14.1.1937), 79–114 (12.8.1937), 115–138 (24.3.1938), 139–188 (20.7.1939), 189–236 (25.8.1950), 237–288 (30.8.1954), 289–417 (30.4.1958). University of Cape Town. Cape Town
5. Bolus L. (1961) Notes on Mesembryanthemum and allied genera. JSAB 27: 111–123, 169–180, 255–265