1-    O.  COerulea,  Gray.     Annual  or  biennial,  smooth;  stems  tufted,  fork-
ing; leaves  lanceolate,  those  at  the  base  spatulate,   clustered;  peduncles  elon-
gated, erect  or   spreading.     (Houstonia  co-rulca,  L.     11.  patens,  Ell.)  —  Moist
banks,  Florida  to  Mississippi,  and  northward.     February  and  March.  —  Stems
3' -6'  high.     Corolla  blue  or  white,  yellow  in  the  throat.
2.  O.  serpyllifolia,  Gray.  Perennial,  smooth ;  Btems  filiform,  prostrate,
branching;  leaves  ovate  or  roundish,  abruptly  contracted  into  a  long  and  slen-
der petiole;  peduncles  elongated,  terminal  and  in  the  forks  of  the  stein.  (HoUS-
tonia  serpyllifolia,  Michx.)  —  High  mountains  of  North  Carolina.  —  Stems  G'-
12' long.     Peduncles  1'- 2' long.
3.  O.  rotundifolia,  Gray.  Perennial;  stems  diffuse,  creeping;  leaves
round  or  oval,  fleshy,  abruptly  contracted  into  a  short  petiole  ;  peduncles  mostly
shorter  than  the  have-,  recurved  in  fruit;  flowers  white.  (Houstonia  rotundi-
folia, Michx.)  —  Sandy  soil  near  the  coast,  Florida  to  South  Carolina,  and  west-
ward. February  and  March,  and  bearing  apctalous  fruiting  flowers  through  the
year.
*  *   CoroUaJunnel-shajwd :  flowers  dian'ously  dimorphous  :  capsule  free  at  the  apex:

stem  4-any/cd :  flowers  in  terminal  cymes,

4.  O.  purpurea,  Gray,  Pubescent;  stem  branching,  erect;  leaves  ovate
or  lanceolate-ovate,  sessile,  3-5-ribbod;  calyx-lobes  longer  than  the  capsule;

corolla  purple  or  nearly  white,  slightly  hairy  within  ;  capsule  roundish,      (lb. ns

Ionia  purpurea,  L.)  —  Woods,  Mississippi  to  North  Carolina,  and  oorthward.
June  and  duly.  --  Stems  y'-l2'  high.     Calyx-lobes  occasionally  3-4  tine
length  of  the  capsule.
RLBIACK.K.       (MADDER    FAMILY.)  181

Yar.  loilgifolia,  Gray.  Smooth;  leaves  lanceolate  or  linear,  1-ribbed,  the
lowest  spatulate-oblong ;  calyx-lobes  as  long  as  the  globose  capsule.  (IIous-
tonia  Iongifolia,  Willd.)  —  With  the  preceding.
