— 294 — 
17. 0. Hassleri R. Knuth,. — Suffruticosa, 30—50 cm alta, 
+ dense foliata, dense hirsuto-pubescens. Foliola 3; medium deltoideo- 
obcordatum; lateralia obcordata; omnia antice retusa vel vix perspicue 
excisa, pilis adpressis dense obsita, subtus sericea, usque 3 cm longa 
et 2!/, em lata; medium petiolulo 6—8 mm longo suffultum; petiolus 
usque 4 cm longus, strietus, hirsutus. Pedunculi 3—8 cm longi, stricti, 
apice cymam umbelliformem vix dissolutam 6—8-floram gerentes, 
Pedicelli 4—10 mm longi. Sepala ovato-lanceolata, 1 cm longa. Petala 
17—20 mm longa, flavescentia (?). Stamina styligue puberuli. — Ex 
affınitate O. physocalyx. 
Paraguay: Am oberen Apa (Hasster a. 1901—02 n. 7732 sub 
O. grisea — Typus!). Zwischen Rio Apa und Rio Aquidaban (FIEBRIG 
a. 1908—09 n. 4117!). Sierra de Amambay (Hassrer a. 1912—13 
n. 12013!). 
18. 0. alta R. Knuth. — Suffruticosa, 1—2 m alta; ramuli 
hornotini lutescenti-villosi, foliis et pedunculis dense ornati. Foliola 3, 
aequalia, oblongo- vel lanceolato-ovata, basi apiceque saepe obtusa, supra 
pubescentia, margine et subtus pubescenti-villosa, 25—30 mm longa, 
13 mm lata; medium petiolulo 5 mm longo suffultum; petiolus ad 4 cm 
longus, lutescenti-villosus. Pedunculi eirc. 5 cm longi, villosi, apice 
cymam umbelliformi-contracetam parum perspicue bilateralem circ. 
6-floram gerentes. Pedicelli I—5 mm longi, subhirsuti. Sepala 4—5 mm 
longa, lanceolata vel ovata, obtusiuscula, tomentoso-villosa. Petala 7 mm 
longa, pallide lutea. Stamina stylique dense puberula, maiora robuste 
denticulata. Capsula ovata, 7—8 mm longa. 
Brasilien: Prov. Ceara, am Riacho do Coepim, Serra de Baturite 
(Ute a. 1910 n. 9053!). — Blüh. September. 
19. O0. ovalis Ruiz in sched. — Suffruticosa, superne dense 
ferrugineo-tomentoso-sericea et sat dense foliata. Foliola 3, ovalia vel 
oblongo-ovalia, apice rotundata, basi rotundata vel cuneata, longe ad- 
presse pilosa, subtus subfusco-sericea, 30 mm longa, 13 mm lata; medium 
petiolulo 31/,—5 mm longo suffultum; petiolus 2—4!/, cm longus. 
Peduneuli 3!/,--41/, cm longi, ferrugineo-pubescentes vel -subhirsuti, 
apice cymam umbelliformem non dissolutam 6--8-floram gerentes. 
Pedicelli 2—5 cm longi, hirsuti. Sepala sub flore 4 mm, demum 7 mm 
longa, ovata, non raro demum glabrescentia. Petala sepalis 2—21/,-plo 
longiora, lutea. Capsula ovoideo-rotundata vel rotundata, 6 wm diam, 
Peru (Rviz!) 
20. 0. piauhyensis R. Knuth. — Suffruticosa, 40—50 cm alta, 
lignosa; rami hornotini densissime tomentoso-puberuli, vix dense foliati. 
Foliola 3, supra sparsim sericea, subtus lanuginoso-sericea, lanceolata, 

