Strobilanthes dimorphotricha subsp. rex (C. B. Clarke) J. R. I. Wood

Kladwong, Pornchai & Chantaranothai, Pranom, 2024, Notes on Strobilanthes (Acanthaceae) with capitate inflorescences in Thailand, PhytoKeys 244, pp. 89-126 : 89-126

8. Strobilanthes dimorphotricha subsp. rex (C. B. Clarke) J. R. I. Wood , Kew Bull. 61 (1): 2006.

Figs 3 , 10 C

Strobilanthes anfractuosa C. B. Clarke , Bot. Jahrb. Syst. 41 (2): 66. 1907. Type: Thailand, Doi Inthanon [Doi Angka], 1150 m., 17 Jan 1905, Hosseus 336 (holotype M [ M 0168700 image!]; isotypes BM!, K [ K 001514926!], P [ P 00719248 image!]).

Goldfussia anfractuosa (C. B. Clarke) Bremek. , Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk., Sect. 2. 41 (1): 269. 1944. Type: Based on Strobilanthes anfractuosa C. B. Clarke

Strobilanthes pentastemonoides (Nees) T. Anderson var. anfractuosa (C. B. Clarke) Benoist in Lecomte et al., Fl. Indo-Chine 4: 667. 1935. Type: Based on Strobilanthes anfractuosa C. B. Clarke

Strobilanthes rex C. B. Clarke , Bot. Jahrb. Syst. 41 (2): 68. 1907. Type: Thailand, Doi Inthanon [Doi Anga], Hosseus 352 (holotype M [ M 0168691]; isotypes BM [ BM 000793208!], C [ C 10005214 image!], CORD [ CORD 00005092 image!], E [ E 00749032!, E 00749033!, E 00749034!], K [ K 001514927!], P [ P 00719419 image!, P 00719420 image!, P 00719421 image!]).

Goldfussia rex (C. B. Clarke) Bremek. , Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk., Sect. 2. 41 (1): 283. 1944. Type: Based on Strobilanthes rex C. B. Clarke

Strobilanthes pentastemonoides (Nees) T. Anderson var. rex (C. B. Clarke) Benoist in Lecomte et al., Fl. Indo-Chine 4: 667. 1935. Type: Based on Strobilanthes rex C. B. Clarke

Type.

Based on Strobilanthes rex C. B. Clarke

Distribution.

Myanmar, China, Thailand, Laos.

Ecology.

Common in evergreen forest; 375–2,540 m alt., flowering and fruiting from July to April.

Selected specimens examined.

Thailand, Northern: Mae Hong Son, Pai, Doi Kiew Lom, 1,490 m alt., 16 Jan 1983, Koyama et al. 32588 ( BKF); Chiang Mai, Doi Chiang Dao WS, 13 Feb 1958, Bunchuai 716 ( BKF); ibid., 1,200 m alt., 17 Feb 1958, Sørensen et al. 1298 ( E); ibid., 1,200 –1,600 m alt., 6 Jan 1975, Geesink et al. 8117 ( BKF, K, L); ibid., 14 Oct 2019, Kladwong 489 ( KKU); ibid., Doi Inthanon NP, ca. 2,500 m alt., 19 Jan 1905, Hosseus 352 ( BM, CORD, E- 3 sheets, K, M, P- 3 sheets); ibid., 17 Jan 1905, Hosseus 334 ( BM); ibid., 17 Jan 1905, Hosseus 336 ( BM, K, M, P); ibid., Doi Pha Hom Pok NP, 1,600 –2,350 m alt., 12 Feb 1983, Koyama et al. 33423 ( BKF); ibid., Doi Suthep-Pui NP, 14 Dec 1904, Hosseus 244 ( BM, E, K, L); ibid., 900 m alt., 16 Jan 1910, Kerr 935 ( AAU, BM, L); ibid., 1,676 m alt., 20 Nov 1910, Kerr 1548 ( BM); ibid., 900 m alt., 8 Jan 1911, Kerr 1568 A ( BM- 2 sheets, K, TCD); ibid., 1,676 m alt., 10 Dec 1911, Kerr 1568 B ( AAU, BM, K, L); ibid., Doi Pui Campground trail, 1,510 m alt., 20 Dec 2019, Balslev et al. 10024 ( AAU); ibid., 4 Oct 2019, Kladwong 473 ( KKU); Chiang Rai, Doi Luang NP, Pu Kaeng Waterfall, 592 m alt., 2 Mar 2015, Norsaengsri 11746 ( QBG); ibid., Mae Sai, 1,350 m alt., 4 Feb 2006, Maxwell 06-129 ( QBG, CMUB, L); ibid., Tham Luang-Khun Nam Nang Norn NP, 800 m alt., 22 Jan 2000, Suksathan 2270 ( QBG); Phayao, Chiang Kham, Phu Lang Ka, 1,500 m alt., 18 Jan 2006, Suksathan 3641 ( QBG, CMUB); Nan, Doi Phu Kha NP, 1,500 –1,600 m alt., 13 Dec 1990, Larsen et al. 41910 ( AAU); ibid., 1,700 m alt., 28 July 1992, Larsen et al. 43702 ( AAU); Lampang, Chae Son NP, 1,150 m alt., 7 Jan 1996, Maxwell 96-18 ( BKF, CMUB); Uttaradit, Phu Soi Dao NP, Sai Thong Waterfall, 1,615 m alt., 17 Nov 2009, Norsaengsri & Intamusik 6162 ( QBG); Tak, Mae Sot, Pha Charoen Waterfall, 680 m alt., 10 Feb 2002, Simpson et al. 2078 ( K, TCD); Phitsanulok, Chat Trakan, 22 Jan 2009, Maknoi 3002 ( QBG); ibid., Phu Hin Rong Kla NP, 1,400 –1,600 m alt., 10–11 Dec 1990, Larsen et al. 41827 ( AAU) & 41878 ( AAU); North-eastern: Phetchabun, Nam Nao NP, 18 Jan 2003, Chantaranothai et al. s. n. ( BKF); Loei, Phu Suan Sai NP, 19 Dec 2006, Maknoi et al. 1238 (QBG- 2 sheets); ibid., Phu Kradueng NP, 1,100 –1,200 m alt., 28 Nov 1965, Tagawa 491 ( BKF, KYO- 2 sheets); ibid., Wang Kwang Waterfall, 1,190 –1,250 m alt., 16 Nov 1979, Shimizu et al. 23219 ( BKF, KYO, L); Eastern: Chiyaphum, Nam Phrom, 600 m alt., 10 Dec 1971, van Beusekom et al. 4097 ( BKF, K, L); South-western: Kanchanaburi, Ta Kanun, 400 m alt., 19 Jan 1962, Kerr 10267 ( BK, BM, K); Peninsular: Ranong, Kaper, Khao Pawta Luang Kaeo, 940–1,300 m alt., 10 Dec 1979, Shimizu et al. 26724 ( BKF, L), 26739 ( BKF), 26841 ( BKF) & 26887 ( BKF, L); Nakhon Si Thammarat, Lan Saka, Khao Luang, 19 Nov 1955, Snan 312 ( BKF).

Preliminary conservation status assessment.

This species has an Extent of Occurrence ( EOO) of 295,960.413 km 2 and an Area of Occupancy ( AOO) of 176.000 km 2 and is assessed as Least Concern ( LC) following IUCN (2022).

Notes.

Strobilanthes dimorphotricha subsp. rex differs consistently from subsp. dimorphotricha Hance from China and Vietnam in the rigid and subequal or sometimes unequal leaves. Subsp. rex appears similar to S. paniculiformis J. R. I. Wood in which the calyx lobe has 1 lobe longer than others. However, it differs by having ovate or elliptic-lanceolate bracts vs. ovate-orbicular in S. paniculiformis .

Figures

Figure 3. Strobilanthes dimorphotricha subsp. rex (C. B. Clarke) J. R. I. Wood A, B stem, leaves and inflorescences C inflorescence D corolla lobes and anthers.

Figure 10. Distribution maps of Strobilanthes with capitate inflorescence in Thailand A S. aprica (Hance) T. Anderson, S. articulata J. B. Imlay and S. brandisii T. Anderson B S. capitata (Nees) T. Anderson, S. chiangdaoensis Terao and S. consors C. B. Clarke C S. cruciata (Bremek.) Terao, S. dimorphotricha subsp. rex (C. B. Clarke) J. R. I. Wood and S. echinata Nees D S. erecta C. B. Clarke, S. esquirolii H. Lév. and S. falconeri T. Anderson.