582 ASCLEPIADEZ (Brown). [Periglosswm. 
attached to the pollen-masses. Sfyle not exserted beyond and 
mostly covered by the anther-appendages. 
Perennial erect herbs; rootstock a tuber; stem solitary, simple; leaves 
linear, erect or spreading; umbels 2-4, racemosely arranged along the upper 
part of the stem, pedunculate, globose, densely 6- to many-flowered ; pedicels 
4- lin. long. 
Distris. Species 4, endemic, very similar to one another in general 
appearance. 
Closely allied to Cordylogyne and united with that genus by Bentham, but the 
presence of filaments alternating with the corona-lobes and the remarkable 
differences in the anthers and pollen-masses (which 3 characters are not noted 
by any previous author), combined with the much longer style, have induced me 
to retain Periglossum as a distinct genus. The exsertion of the style is the 
only distinction other authors have noted, but as species with and without an 
exserted style occur in several genera, it would seem to be of no generic value if 
taken alone. The umbels of Periglosswm are also usually more numerous, 
and their peduncles and pedicels very much shorter than in Cordylogyne. Dr. 
Schlechter also upholds the two genera, but gives no word of distinction. : 
Blade of the corona-lobes sagittate-ovate, as long as 
the stalk; alternating filaments filiform, 3-1? lin. HS 
Beng ORO? Gre Boag: een, ene) engustifeian, 
Blade of the corona-lobes oblong or lanceolate-oblong 
to elliptic-oblong, 2-24 times as long as the stalk : 
Filaments alternating with the corona-lobes, 
filiform, about 1 lin. long is eee a 
Filaments alternating with the corona-lobes, 
minute or rudimentary : 
. Leaves suberect ; corona-lobes. with a stout 
longitudinal double keel on the upper : 
half and 2 slender contiguous keels below (3) kassnerlanum. 
Leaves very spreading; corona - lobes 
thickened at the apex, without any ~— iy 
longitudinal keel... rege see eee (4) ~ MoKeni, 
(2) mossambicense. 
1. P. angustifolium (Decne in DC. Prodr. viii, 520); stem 
solitary, 1-22 ft. high, simple, more or less unifariously or bifariously 
puberulous at the upper part, glabrous below ; leaves erect to spread- 
ing, 13-5 in. long, 1-11 lin, broad, linear, acute, with revolute 
margins, glabrous on both sides or the midrib puberulous beneath ; 
umbels 2-5, racemosely arranged, pedunculate, dense, globose, about 
&% in, in diam., many-flowered; bracts 13-2 lin. long, subulate, 
slightly puberulous ; pedicels 1—3 lin, long, puberulous ; sepals 2 lin. 
long, 2-1 lin. broad, lanceolate, acute, puberulous with somewhat 
tortuous hairs; corolla-lobes erect or but slightly spreading, about 
3 lin. long, 12-11 lin. broad, linear-oblong, somewhat abruptly 
acute, glabrous on both sides; corona-lobes arising at the base of 
the staminal column and slightly overtopping it, 13-24 lin. long, 
erect, stalked, with the blade about as long as the linear stalk, 
1-11 lin. broad, broadly sagittate-ovate, obtuse, with 2 prominent 
contiguous keels on the inner face, which are capped at their apex 
by a transverse keel or flap aeross the thickened top of the lobes + 
alternating filaments at the base of the lobes 2-13 lin. long, filiform, 
often resting in the channel on the back of the anthers ; staminal 
