512 2I(). ACANTHACEAE 



80. (73.) Anther-halves inserted at unequal heights 8i 



Anther-halves inserted at the same level, unappendaged at the base. . loi 



81. Anther-halves, both or the lower one, prolonged at the base into a spur- or 



tail-like appendage 82 



Anther-halves blunt or pointed, sometimes bearing a short mucro, but 

 neither spurred nor tailed 92 



82. Corolla-tube barrel-shaped, widened from the base ; lips short. Calyx- 



segments very long and narrow. Stamens inserted in the middle of the 

 corolla-tube. Upper anther-half without a spur. Disc cup-shaped. 

 Fruit contracted into a long stalk. Shrubs. Flowers panicled, red. 

 Bracts and bracteoles small. — Species 2. Island of Socotra. 



Trichocalyx Balf. fil. 

 Corolla-tube cylindrical or narrowly funnel-shaped 83 



83. Corolla-tube very long, much longer than the limb. Herbs or under- 



shrubs. Flowers solitary or 2 — 3 together in the axils of the leaves. 



Bracts narrow 84 



Corolla-tube short or rather short 85 



84. Corolla very large, red. Stamens inserted in the upper part of the corolla- 



tube. Leaves lanceolate. — Species i. South-east Africa. (Under 



Siphonoglossa Oerst.) Aulojusticia Lindau 



Corolla medium-sized. Stamens inserted in the lower part of the corolla- 

 tube. Leaves elliptical to orbicular. — Species 3. South and East 

 Africa. (Under Justicia L.) .... Siphonoglossa Oerst. 



85. Disc cup-shaped. Stamens inserted at the throat of the corolla. Pollen- 



grains with several longitudinal rows of tubercles sometimes replaced 

 by patches. Partition of the fruit not separating from the valves at 

 maturity. — Species 160. Tropical and South Africa and Canary 

 Islands. Some of the species are used as ornamental, medicinal, or 

 dye-plants. (Including Adhatoda Nees, Dianthera L., Gendarussa Nees, 

 Monechma Höchst., and Rhytiglossa Nees). (Plate 142.) Justicia L. 

 Disc ring-shaped. Pollen-grains usually without tubercles. ... 86 



86. Calyx-segments 4 87 



Calyx-segments 5 88 



^j. Flowers in spikes arranged in false umbels at the ends of the branches. 

 Fruit contracted into a short stalk. Shrubs. — Species i. Madagascar. 



Corymbostachys Lindau 



Flowers in axillary spikes. Fruit contracted into a rather long stalk. 



Herbs. — Species 5. Madagascar and West Africa. {Vnder Justiciar.) 



Anisostachya Nees 



88. Flowers in panicles 8g 



Flowers in spikes 90 



89. Stem woody, shrubby. Inflorescences scantily branched. Bracts very 



narrow. Corolla blue. Anther-halves both spurred. Fruit contracted 

 into a short stalk. — Species i. Equatorial West Africa (Cameroons). 

 (Under Justicia L.) Salviacanthus Lindau 



