Psilotrichum gnaphalobryum (Hochst.) Schinz., Vierteljahrsschr. Naturf. Ges. Zürich

Hassan, Walaa A., Al-Shaye, Najla A. & Iamonico, Duilio, 2023, A critical inventory of the family Amaranthaceae s. str. in Saudi Arabia, Phytotaxa 626 (4), pp. 223-246 : 238-239

9.1. Psilotrichum gnaphalobryum (Hochst.) Schinz., Vierteljahrsschr. Naturf. Ges. Zürich 57: 550. 1912 ≡ Psilostachys gnaphalobryum Hochst., Flora 27(1 Beibl.): 6. 1844 ≡ Psilotrichum cordatum Moq., Prodr. [A. P. de Candolle] 13(2):

280. 1849.

Lectotype (designated here): — YEMEN. Hedschas , In rupibus montis Gesser in Arabiae felicis, 26 feb 1836, Schimper 785 ( TUB000386 !, image of the lectotype available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.tub000386?l oggedin=true); isolectotypes: E00641651 (image available at https://data.rbge.org.uk/herb/E00641651), E00641652 (image available at https://data.rbge.org.uk/herb/E00641652), E00641653 (image available at https://data.rbge.org.uk/herb/ E00641653), GOET005661 (image available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.goet005661), HEID701185 (image available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.heid701185), HBG503193 (image available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.hbg503193), HBG503194 (image available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.hbg503194), JE00026006 (image available at https://plants. jstor.org/stable/viewer/10.5555/al.ap.specimen.je00026006) MEL2458533 (image available at https://plants.jstor.org/stable/ viewer/10.5555/al.ap.specimen.mel2458533), MPU007236 image available at (image available at https://plants.jstor.org/stable/ viewer/10.5555/al.ap.specimen.mpu007236), P00606391 (image available at https://plants.jstor.org/stable/viewer/10.5555/ al.ap.specimen.p00606391), P00606392 (image available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen. p00606392), P05003915 (image available at http://mediaphoto.mnhn.fr/media/1441382299466oPQDjdm1b9lCLsXv), P05003921 (image available at http://mediaphoto.mnhn.fr/media/14413822995820QcE9jvO3GzATTBS), P05003924 (image available at http://mediaphoto.mnhn.fr/media/1441382299642CZm9mskwhFs7R3Kl), P05003925 (image available at http://mediaphoto.mnhn.fr/media/1441382299661UlfvGuKOFRX4GqGd), P05003926 (image available at http://mediaphoto.mnhn.fr/media/1441382299680n3oD9qRyB1g8fZeH), P05003928 (image available at http:// mediaphoto.mnhn.fr/media/1441382299719hQeTkIINg14vaFwM), P05003929 (image available at http://mediaphoto. mnhn.fr/media/1441382299739Vr03gqx7K8kSkFpm), P05003930 (image available at http://mediaphoto.mnhn. fr/media/1441382299759TKc3wHVKns66FkPf), P05003932 (image available at http://mediaphoto.mnhn.fr/media/ 1441382299798Pav6UJ9qra99FQqK), TUB000387, image available at (https://plants.jstor.org/stable/viewer/10.5555/al.ap. specimen.tub000387?loggedin=true).

– Achyranthes cordata Hochst., Flora 27(1 Beibl.): 6. 1844, nom. inval. (Art. 36.1b of ICN).

Typification of the name Psilostachys gnaphalobryum :— Hochstetter (1844: 6) validly published Psilostachys gnaphalobryum by providing a detailed description; the following syntype was also reported: “Ad rupes montis Gesser in Arabiae provincia Hedschas d. 27. Febr. 1836, nec non in Abyssiniae provincia Modat Aprili 1839 legit. W. Schimper ...”. Moreover, Hochstetter (1844: 6) reported, after the name, “( Achyranthes cordata Hichst. et Steud. In pll. exsicc. Un. it. Arabicis nr. 785)”. Since “ Achyranthes cordata ” was published here for the first time and it was placed in synonymy, it is not validly published according to the Art. 36.1b of ICN .

We traced fourteen specimens, at E (E00641651, E00641652, E00641653), GOET (GOET005661), HEID (HEID701185), HBG (HBG503193, HBG503194), JE (JE00026006), MEL (MEL2458533), MPU (MPU007236), P (P00606391, P00606392), and TUB (TUB000386, TUB000387) bearing plants collected “ In rupibus montis Gesser in Arabiae felicis ” in february, 26 1836 by W. Schimper and numbered as “785”. These specimens are clearly original material for Psilostachys gnaphalobryum and all match Hochstetter’s description. Since TUB000386 includes more leaves and flowers, which are important taxonomic characters in the genus Psilostachys (see Townsend 1980, Bao et al. 2003), we here designate it as the lectotype of the name. GOET005661, MEL2458533, MPU007236, and TUB000387 are the isolectotypes; further isolectotypes occur at P (see below under “Notes on the name Psilotrichum cordatum ”).

Notes on the name Psilotrichum cordatum : — Moquin-Tandon (1849: 280) listed Psilotrichum cordatum reporting as synonyms “ Achyranthes cordata Hochst. et Steud. ! In Schimp. It. n. 785. Phylostachys gnaphalobryum Hochst. ! l.c. [loco citato] t. 4”. As stated above, “ Achyranthes cordata ” is an invalid name. Therefore, Moquin-Tandon’s P. cordatum should be written as Psilotrichum cordatum Moq. (as correctly reported by IPNI 2023), not “ Psilotrichum cordatum (Hochst.) Moq. ” as reported, e.g., by POWO (2023). However, since the valid and legitimate name Gnaphalobryum is cited by Moquin-Tandon (1849: 280) as synonym, his Psilotrichum cordatum is a superfluous and illegitimate name according to Art. 52.2 of ICN. Note also that Moquin-Tandon (1849: 280), by citing Schimper’s specimen no. 785, did not excluded the type of Phylostachys gnaphalobryum . In fact, we traced nine specimens at P (P05003915, P05003921, P05003924, P05003925, P05003926, P05003928, P05003929, P05003930, P05003932) identified as “ Achyranthes cordata ” and collected in “rupibus montis Gesser in Arabiae felicis” by W. Schimper (collection number: 785), according to the labels. These specimens are those cited by Moquin-Tandon (1849: 280) under P. cordatum and correspond to Schimper’s collections of P. gnaphalobryum , thus being original material for theis latter name (see above).

Therefore, Psilotrichum cordatum can be considered as a homotypic synonym of Phylostachys gnaphalobryum . Chorology:― A species native to north-eastern Tropical Africa, extending to Kenya and the Arabian Peninsula ( POWO 2023).

Occurrence in Saudi Arabia:— ʿAsīr ( Collenette 1999), Jazan and Makkah ( Miller & Cope 1996).

Specimina visa selecta:— ʿAsīr, Raida, 21 may 1998, Alfahran & Thomas 6015 (KFU!).