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23,3 Merrill: Diagnoses of Hainan Plants, II 265 



1908, from Kwangtung Province, China, localized as Yam Chow, 

 the genus being dedicated to this collector, Professor Ts'oong 

 (Chung) Kwan Kwong of Peking University. 



Tsoongia is most closely allied to Premna, and is somewhat 

 intermediate between Vitex and Premna, although distinctly 

 closer to the former. It differs notably from Vitex in its sub- 

 equally 4- or 5-lobed corollas which are not bilabiate, and 

 from Premna in its slender, elongated corolla tubes, its strictly 

 axillary inflorescences, its glabrous corolla throats, and its entire 

 styles. In Premna the corolla tubes are short and broad, while 

 the inflorescences are strictly terminal, except in a single species, 

 P. cauliflora Stapf. In the present genus the corolla throats 

 are not bearded, the tube being glabrous within except for a 

 few hairs below the insertion of the filaments. 



SOLANACEAE 



SOLANUM DEBILISSIMUM sp. nov. 



Herba prostrata, vix ramosa, usque ad 60 cm longa, caulis 

 1 ad 1.5 mm crassis, sulcatis, parce pilosis, nodis plerumque 

 radicantibus ; foliis membranaceis, oblongo-ovatis, utrinque 

 sparse sed perspicue crispatulo-pilosis, plerumque in paribus 

 inaequalibus, minoribus usque ad 2.5 cm longis et 1.5 cm latis, 

 majoribus usque ad 6 cm longis et 2.5 cm latis, basi rotundatis, 

 apice acutis ad acuminatis, nervis utrinque 4 ad 6, tenuibus, 

 obscuris; floribus axillaribus, solitariis, purpureis, pedicellis 

 usque ad 1 cm longis ; calycis crispatulo-pilosis, 4 mm diametro, 

 10-lobatis, lobis linearis, patulis, 2 ad 3 mm longis ; corollae tubo 

 1.5 mm longo, lobis lanceolatis, membranaceis, 6 ad 7 mm 

 longis, acuminatis, parce ciliatis; antheris oblongo-ovatis, 3 

 mm longis; fructibus globosis, carnosis, laevis, glabris, rubris, 

 circiter 6 mm diametro, seminibus paucis (circiter 6), com- 

 pressis, reniformi-ovatis, 2 mm longis, obscure denseque reticu- 

 latis. 



Ng Chi Leng, McClure 9532, May 11, 1922, along the margins 

 of streams in forested ravines. 



A species allied to Solanum biflorum Lour., but totally dif- 

 ferent from that species in its habit, as well as in numerous 

 other characters. 



RUBIACEAE 



ARGOSTEMMA DISCOLOR sp. nov. 



Herba simplex vel ramosa, 7 ad 12 cm longa, erecta vel 

 deorsum procumbens, ramis hirsutis; foliis in paribus valde 



