Trichocauton. | ASCLEPIADEA: (Brown). 891 
ed. 2, ii. 90; Pers. Syn. Pl. i. 279; Poir. Eneyel. vii. 383, and in’ 
Dict. Se. Nat. 1. 393 ; Haw. Syn. Pl. Suce. 24; Schultes, Syst. vi. 24 ; 
Spreny. Syst. i. 839; G. Don, Gen. Syst. iv. 116; Dietr. Syn. Pl. ii. 
885; Loud. Encycl. Pl. 200, fig. 3296; Decne in DC. Prodr. viii. 
655. Piaranthus piliferus, Sweet, Hort. Brit. ed. 2, 359. 
Sours Arrica : without locality, Mund and Maire, 288 ! and cultivated specimen ! 
Coast Reaion: Oudtshoorn Div. ; on the Karoo the other side of Attaquas 
Kloof, Thunberg ! Masson. 
CentRAL Reeron: Calvinia or Sunderland Div. ; Karoo below the Roggeveld, 
Thunberg. Prince Albert Div. ; near Weltevrede, Drége, 5615 ! 
3. T. rusticum (N. E. Br.); plant about 5 in. high, similar 
to T. piliferum; stems with 17-20 (or more?) vertical series of — 
conical tubercles, tipped with a slender dark-brown spine or 
stiff bristle about 2 lin. long, glaucous-green or purple-tinted ; 
pedicels about 1 lin. long, glabrous; sepals }-1 lin. long, ovate, 
acuminate, glabrous; corolla with a distinct campanulate tube 
about 1 lin. long, glabrous outside and within ; lobes spreading, 
about 4 in. long and broad, deltoid-ovate, acute, glabrous on the 
back, with a microscopic pubescence on the inner face, not ciliate, 
dark purple-brown (Marloth) ; outer corona of 5 erect deeply bifid 
lobes or pairs of deltoid-ovate obtuse teeth about } lin. long, 
alternating with the anthers and rising to about the level of the top 
of the staminal column ; inner corona-lobes about } lin. long, linear- 
oblong, obtuse, closely incumbent on the backs of and about half as 
long as the anthers, with a broad dorsal connection with the outer 
corona at their base. 
Centra Recron: Kenhardt Div. ; Kenhardt, Marloth, 3764! 
Described from a living stem, and fresh flowers preserved in fluid. The 
pubescence on the inner surface of the corolla-lobes is exceedingly minute, and 
invisible when wetted. 
4. T. Alstoni (N. E. Br. in Kew Bulletin, 1906, 166); plant 
about 6 in. high, branching at the base; stems about 14-1? in. 
thick, excluding the spines, many-angled, glabrous and apparently 
glaucous ; angles with closely placed tubercles tipped with a stiff 
spine 3-5 lin. long ; flowers in small fascicles between the angles 
of the stem; bracts minute, subulate ; pedicels 14-2 lin. long, 
glabrous ; sepals erect, 1} lin. long, § lin. broad, ovate, acuminate, 
glabrous ; corolla glabrous and smooth inside and out, yellow, 
acutely pointed in bud; tube 2-2} lin. long and about the same in 
diam. at the mouth, campanulately funnel-shaped ; lobes 2-2} lin. 
long, 14-13 lin. broad at the base, ovate, very acute or somewhat _ 
acuminate, ascending in the dried state, probably spreading when — 
alive ; outer corona cup-shaped at the base, subequally 10-toothed 
or with 5 pairs of teeth behind the inner corona-lobes, glabrous ; 
teeth 1-2 lin. long, deltoid or subulate, obtuse or acute, erect or 
. - ineurved over the staminal column ; inner corona-lobes } lin. long, 
