350  Strophanthus  Seed  of  Commerce.      {Xm  ^X;S£XUX' 
IV.  Graciles. — Leaves  usually  thin  and  more  or  less  glabrous, 
secondary  veins  inconspicuous.  Of  this  section  three  species  are 
known  : 
(1)  5.  Preussii,  Engl,  and  Pax,  which  has  the  leaves  quite  glabrous 
and  the  corolla  tube  dilated. 
(2)  5.  gracilis,  Schum.  and  Pax,  which  has  leaves  that  appear 
punctate  on  the  upper  side,  short  scabrous  hairs  on  the  under  sur- 
face of  the  leaf,  and  the  scales  in  the  corolla  tube  glabrous. 
(3)  S.  scaber,  Pax,  which  has  leaves  minutely  scabrous  on  both 
sides,  and  the  scales  of  the  corolla  tube  downy. 
V.  Sarmentosi. — The  leaves  are  quite  glabrous,  but  somewhat 
rigid  or  coriaceous,  with  the  secondary  veins  evidently  reticulated. 
This  section  includes  five  species  : 
(1)  S.  sarmentosusy  A. DC,  a  climbing  plant  with  long  petioled 
leaves  (for  the  genus)  and  the  calyx  lobes  broadly  oblong  lanceolate. 
(2)  5.  laurifolius,  A. DC,  has  leathery  leaves,  with  the  secondary 
veins  prominent  underneath,  and  the  calyx  lobes  narrowly  elliptic. 
(3)  5.  Peter sianas,  Klotsch,  is  an  erect  shrub  with  divaricate 
branches,  with  small  leaves,  and  the  calyx  lobes  narrowly  oblong 
lanceolate. 
(4)  S.  intermedins,  Pax,  has  triangular  calyx  lobes  and  compara- 
tively short  corolla  lobes,  and  the  scales  of  the  corolla  are  lanceo- 
late. 
(5)  5.  Amboensis,  Engl,  and  Pax,  has  lanceolate  calyx  lobes  and 
linear-subulate  corolla  scales. 
Of  5.  sarmentosus  there  are  three  varieties,  differing  in  the 
length  of  the  corolla  tube  and  limb,  the  length  of  the  petiole,  and 
the  development  of  the  lenticels  of  the  bark.  The  variety  verruco- 
sus, Pax,  is  described  as  a  shrub;  it  has  warty  lenticels  on  the  bark. 
A  plant  possessing  this  character  was  grown  by  Mr.  T.  Christy  from 
"  Kombe  "  seed,  and  a  specimen  of  it  is  in  the  Herbarium  of  the 
Society. 
The  following  are  the  points  which  it  is  desirable  for  collectors  of 
Strophanthus  plants  to  observe  in  discriminating  species  : 
(1)  The  shrubby  or  climbing  character  of  the  plant. 
(2)  The  hairiness  or  otherwise  of  the  leaf  and  the  prominence  of 
the  veinlets. 
(3)  The  relative  length  of  the  tails  to  the  petals  and  of  the  glands 
at  the  base  of  the  corolla  lobes. 
