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THAI FOREST BULLETIN (BOTANY) 36

Thailand.— NORTHEASTERN: Loei [Phu Kradung National Park, 11 Sept. 1990, Chantharanothai et al. 90/58 (K, TCD)]; SOUTHWESTERN: Kanchanaburi [Thong Pha Phum distr., Pilok, 10 Jan. 1985, H. Koyama et al.T-48995 (BKF), same locality, 17 Nov. 1985, Staples & Wanthaniyakun 292 (A, AAU, BKF, K)]; CENTRAL: Saraburi [Sam Lan, 13 Oct. 1973, Maxwell 73–482 (AAU)]. Myanmar.— Yangon Division [Yangon (Rangoon), Nov. 1937, Dickason 6691 (L, SING)]; Thaninthanyi Division [Mergui Distr., Sindin, 8 m [25 ft], 21 Nov. 1929, Sukoe 10144 (RAF, 3 shts)].

II. NEWCOMBINATIONS & REDUCTIONS TO SYNONYMY

A.Argyreia breviscapa (Kerr) Ooststr., Blumea 7: 178. 1952.— Lettsomia breviscapa Kerr, Bull. Misc. Inform. Kew 1941: 13. 1941; Fl. Siam. 3: 29. 1954. Type. Thailand. Nakhon Sawan, Hua Wai, 27 Aug. 1931, Put 4045 (isotypes BM!, E!, K!, P!, TCD!).— Argyreia calcicola (Kerr) Ooststr., Blumea 7: 178. 1952, synon. nov.Lettsomia calcicola Kerr, Bull. Misc. Inform. Kew 1941: 14. 1941; Fl. Siam. 3: 29. 1954. Type. Thailand. Kanchanaburi, Khao Tong, 31Aug. 1930, Kerr 19658 (isotypes BK!, BM! [2 sheets], P!, TCD!).— Ipomoea bracteosa Gagnep., Notul. Syst. (Paris) 3: 143. 1915, synon. nov.; Gagnep. & Courchet in H.Lecomte, Fl. Indo-Chine 4: 264. 1915; Nguyen Thi Nhan in Averyanov, Vasc. Pl. Synop. Vietn. Fl. 178. 1990. Type. Vietnam. Phan-rang à Daban, 25 Nov. 1911, Lecomte & Finet 1476 (holotype, P!).

Kerr compared each of his two new species to others in Lettsomia, but did not compare them to one another. Though Kerr had a good eye for recognizing novelties and had the benefit of field knowledge of the plants, in this case he seems to have over-split the taxa. His detailed pencil drawings on the BM isotypes disclose that these two “species” are extremely similar, even when first described. The only points of difference between the two protologues are summarized in the following table:

Character

A. breviscapa

A. calcicola

Bract shape Bracts size Bract indumentum

Ovate Up to 3.8 by 3.5 cm

Ovate Up to 2.5 by 2.0 cm

Strigose with bulbous bases + softer whitish crinkled hairs (on both sides?)

Densely appressed pubescent outside

Corolla size Corolla color Corolla indumentum

ca 5 cm long White Glabrous outside

ca 3.5 cm long White

Sparsely hairy on backs of corolla lobes

Table 2. Purported differences between protologues for A. breviscapa and A. calcicola.

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