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M. arvensis L. from Tucker who obtained it from Dr. R. M. Harley, originally from county of Cornwall, England. (MJM - Axillary flowers, arvensis odor).

M. arvensis var. piperascens - Japan, Northern Progress variety (Hokushin), culture in Hokkaido derived from Aka-Kuki. This cultivar was obtained from C. Thomas, Beltsvlle, MD who obtained it from the U.S. Plant Introduction Station. All other Japanese strains having only menthone were discarded.

M. arvensis var. piperascens - Brazil 701, from Campinas, Brazil. Vigorous, hairy, rust-resistant strain widely grown in Brazil. We were told at Campinas that this cultivar may become susceptible to rust which seems to indicate two strains of rust. This strain was obtained from C. Thomas, Beltsville, MD who obtained it from the U.S. Plant Introduction Station.

(MJM - Short, axillary flowers, male sterile and seed fertile).

(MJM - Axillary flowers, not different from Cornwall (10262) in odor. Male sterile and seed fertile).

M. arvensis donated by S. R. Baquar of Karachi, Pakistan, who obtained this strain from W. Germany. Male sterile and fully seed fertile. Baquar (1965) showed that this strain had 72 somatic chromosomes. Strain is short and tends to be procumbent but produces abundant stolens.

M. arvensis, obtained from S. R. Baquar. We found a somatic mutant, perhaps due to loss of chromosome carrying the male sterility gene, that permits anther development, but this clonal strain gives almost no selfed seeds.

M. arvensis L. from Tucker who colleted it in disturbed soil on the road to Dijon, Chevigny, France. Two clones, one male sterile and one fertile. (MJM - Arvensis odor not different from 10261 and 10262).

M. arvensis, a standard tester strain used in all interspecific hybridizations. The origin of this strain is unknown. We reported the strain as being of European origin since it was part of a collection from Europe. However, J.K. Morton, Univ. of Waterloo, Waterloo, Ont. is quite certain from calyx morphology that it is from North America. Strain is fully fertile and has 96 somati chromosomes as determined by Ikeda (1961). Very susceptible to verticillium wilt and powdery mildew. The strain is true breeding for phorphological appearance and herbage odor. The herbage odor is apparently equivilent to pure isomenthone, but chemical assay of the oil has not been completed. This may be isopulegone rather than isomenthone.

M. arvensis L. var. villosa Benth. F. flabrata (Benth) Stewart; from Tucker who collected it at the north side of Jordan Creek, Allentown, PA. (MJM - Male sterile and resembles 10263 from W. Germany). We do not know from crosses whether this strain has 72 or 96 somatic chromosomes.

M. arvensis. L. var. villosa f. glabrata from Tucker who obtained it from Parks Lake No. 2, Poland, Ont. (MJM - One plant is entirely male sterile, the other has 50% normal anthers and scant pollen, 75% bad pollen).

M. arvensis piperascens S1 high menthol strain. (MJM - First choice).

M. arvensis piperascens S1 high menthol strain. (MJM - 4th choice).

M. citrata; 67% limonene, 24% cineole. This F1 hybrid 1s male sterile, but seed fertile and has the genotype i1i1i2i2Lm1lm1Lm2lm2. This strain has 67.5% limonene and 23.6% cineole. It came from a cross of 10187 x Dutch strain of M. aquatica (10172). Genotype is unusual since all other segregants had linalool and linalyl acetate.

M. aquatica x M. citrata hybrid, isopinocamphone strain; fertile. From the cross M. aquatica x (10188 x Dutch aquatica 10172).

M. piperita type from an aquatica x spicata cross. A single hybrid from the cross of the Dutch strain of M. aquatica (10172) x 10157 (S1 selection of M. spicata having high menthone). This hybrid was saved since the quantitative amounts of the major constituents were somewhat similar to Mitcham. Strain is highly sterile, similar to the Mitcham cultivar.

M. aquatica L. var. crispa (L.) Benth., from Tucker who obtained it from Mrs. J. Jones, Bethlehem, PA. Originally from a private source in Bethlehen, PA. (MJM - appears to be a hybrid between M. aquatica and M. crispa. Flowers terminal and male sterile. Leaves medium, light green, very crisp. Odor weak spearmint. Strain highly seed sterile but a few hybrids with the German strain of aquatica (10176) were sufficint to show that the hybrids were highly variable in morphological appearance. Some were flat-leaved, some were crisp-leaved. Six had a weak peppermint odor with high menthofuran, while 18 were high alcohol and ester carvone types having a very unusual oil constituent).

M. aquatica L. var. crispa (L.) Benth. from Tucker who collected it by Old Mill near the Central Railroad, NE of High Bridge, NJ. Appears to be a hybrid of M. aquatica and M. spicata var. crispa. (MJM - +- 6x hybrid, crisp-leaved, terminal flowers, odor spearmint and hot. Strain is male sterile and highly seed sterile in crosses with Dutch aquatica (10172); 24 secondary hybrids, presumably having 120 somatic chromosomes, were highly variable in appearance with some flat-leaved and others crisp-leaved; some were menthone odored, others were high alcohol spearmints).

M. arvensis x M. spicata hybrid. Strain donated by S. dos Santos, Campinas, Brazil as IAC 09.

M. arvensis x M. spicata hybrid. Selection for high menthone by MJM from M. arvensis cultivar in F2 (4n M. longifolia S2 x M. spicata 2n Line 1) F1 bybrids. About 92% menthone.

M. rotundifolia, male sterile from 10017 (Du. 6 rot.); ms. source: Du. 17-4 (10125); 4th backcross.

M. rotundifolia, male sterile from Thom. rot. 196 (10023); ms. source: Du. 17-4 (10125); 2nd backcross.

M. rotundifolia, male sterile from Thom. rot. 196 (10023); ms. source: Du. 17-4 (10125); 2nd backcross.

M. rotundifolia, male sterile from 2n Syl. (10028); ms. source Du. 17-4 (10125); 4th backcross.

M. rotundifolia, male sterile from 4n Syl. S1 (10029) and 10030); ms. souce Du. 17-4 (10125); 5th backcross. (Note: 10029 and 10030 are colchicine-doubled 10028).

. longifolia, male sterile from Du. Syl. (10029 and 10030); ms. source: 2n rot. (10014); 3rd backcross.

Male sterile strain of 10016 x 10031, 4th backcross. ms. source 10125. (Note: 10031 is indistinguishable from 10028).

Male sterile strain of 10015 x 10029, 4th backcross, ms. source 10125.

Male sterile polyploid 4n Todd Niliaca S1 of 10068, 2nd backcross. Ms. source 10125. (Note: 10068 was a colchicine-induced tetraploid S1 strain from the same source as 10066).

Male sterile polyploid U.S. Niliaca of 10073, 3rd backcross. Ms. source 10125. (Note: 10073 was a tetraploid S1 from the same source as 10072).

Jap. S1, ms. of 10285 (M. arvensis piperascens) (high menthol), 5th backcross. Ms. source Du. aq. ms. (10173). (Note: 10173 was a male sterile duplicate of 10172).

Jap. S1 ms. of 10286 (M. arvensis piperascens) high menthol), 5th backcross. Ms. source Du. aq. ms (10173). (Note: 10286 was identical to 10285).