DIPLOLOPHIUM US'D PIIYSOTETCITIA 
57 
1. D. abyssinicum Benth. & Hook. £. Gen. PI. i. 900 (1867) ; 
Hiern in FI. Trop. Afr. iii. 17. 
Scott-Elliott 6429 ! Bagshaw 1272! etc. in Herb. Mus. Brit. 
2. D. zambesiacum Hiern in FI. Trop. Afr. iii. 18 (1877). 
E}des 651! 269 ! Hand 473! etc. in Herb. Mus. Brit. 
3. D. Duchanani, comb. nov. ( Dhysotrichia Buchanani Benth. 
in Hook. Ic. FI. 1358; 1891.) 
Buchanan 90! 953 ! Whyte 14 ! in Herb. Mus. Brit. 
A large stout plant, with all the characters of Diplolophium , such 
as habit, the large many-rayed umbels, the large and numerous bracts 
of involucre and involucel, and the tomentose fruit. It forms, how¬ 
ever, a very well-marked species, distinguished at a glance from the 
preceding ones by its bipinnate foliage. 
4. D. Swynnertonii , comb. nov. ( JPhysotrichia Swynnertonii 
Bak. fil. in Journ. Linn. Soc. Bot. xl. 76 (1911).) 
As Mr. Baker points out in his description, this and D. Buchanani 
are very closely allied, D. Swynnertonii, a less robust plant, being 
separated by its narrower and more pointed leaflets. 
Swynnerton 649 ! Eyles 743 ! in Herb. Mus. Brit. 
Doubtful Species . 
I am unable to find any real distinction between JPhysotrichia 
arenaria (Engler & Gilg in Kunene Sambesi Expedition, p. 324. 
No. 834 !) and D. zambesiacum Hiern, but it appears to be an alto¬ 
gether smaller plant than the former, so it is perhaps best to leave 
the question open until more material is available. But whatever its 
position specifically, there is no doubt that generically it belongs to 
Dipl oil opbiuni. 
Dhysotrichia TDelence Buscalioni & Muschler in Engler’s Jahrb. 
xlix. 482 (No. 1150 a) I have not seen; it is separated by its 
authors from the last-named solely on the measurements of the bracts 
and bracteoles. These measurements vary (e. g., D. zambesiacum ) 
in accordance with the age of the inflorescence, so that this distinc¬ 
tion seems very unsatisfactory, and I therefore conclude that most 
probably the two plants are inseparable. 
The four species dealt with above have the hairy fruit normal to 
Diplolopliium , as opposed to the papillose fruit of JPhysotrichia. As 
regards this latter point, however, it is to be noted that Wolff in Engler, 
Jahrb. xlviii. 272, has (1912) described as Blnysotrichia Kassneri 
(lvassner, 2416) a plant with hairy ovary (“ovarium .... villosum”) 
the mature fruit of which he had not seen. There is a specimen of this 
in Herb. Mus. Brit, without flowers or fruit, but with the general 
appearance of Dhysotrichia , in fact much like D. TVelwitschii 
Hiern. 
Wolff (l.c.) suggests that it may prove necessary to establish a 
section or sub-genus in Dhysotrichia for plants with hairy fruits ; 
this suggestion does not seem to me sound. 
The ultimate factor in deciding the genus of an Umbelliferous 
