286 Ewart . — On the Stamina l Hairs of Thesinm. 
Osyridocarpos. 
Thesidium. 
Thesium. 
Arjona. 
Quinchamalimn 
The genus Thesium is divided by Bentham and Hooker 
into three sections : — Frisea } Eu the shim, and P silothesium . 
The classification given in the ‘ Pflanzenfamilien 9 (Santalaceae) 
is based on that of Bentham and Hooker, but the section 
P silothesium, which consists of the only two American species 
of the genus, is included in Euthesium, thus : — 
. Sect. i. Frisea, with thick perianth-filaments, consisting 
of about thirty-one species, all from S. Africa. 
Sub-sect. i. With upright staminal hairs behind the 
stamens. 
Sub-sect. 2 . With no staminal hairs behind the stamens. 
Sect. 2. Euthesium, with no perianth-filaments. 
Sub-sect. i. ( Euthesium , Bentb.), flowers in leaf axils or 
terminal, widely dispersed through the Old World, 
including a few S. African, and the Australian and 
S. American species. 
Sub-sect. 2. (. Aetheothesium , Benth.), with umbellate in- 
florescences or crowded heads of flowers. All 
S. African species. 
I have arranged the species I have examined in the follow- 
ing converging series, based merely on the structure of the 
flower, as already described, T. scabrum, T. gnidiaceum, and 
T. funale forming the connecting links between the two 
series. 
Those in the upper part of the larger series correspond 
generally to the sect. Euthesium , since they possess no 
perianth-filaments ; those in the smaller series fall under the 
sect. Frisea. 
Quinchamalium . 
Arjona. 
Osyridocarpos natalensis. 
Thesium himalense. 
