168 KEY TO SUB-CLASSES, ORDERS AND GENERA. 
LXXVIII-—-BORAGINACEAi—cont. 
(1) Style twice forked ; drupe with 1 stone :— .. cdxlix—Cordia. 
(II) Style bifid to the ‘middle or lower down; dru upe with 2—4 pyrenes :— 
cdl—Ehretia. 
(III) Style filiform, stigma 2-lobed; cymes few flowered; drupe with 4 
crustaceous pyrenes :— F cdli—Rhabdia. 
(IV) Style short, undivided ; cymes many- flowered ; drupe scarcely fleshy, of 
two 2-celled 2-seeded pyrenes :— ... cdjii—Tournefortia. 
(V) Style dilated at apex or above the base; ‘cymes terminal, 2-chotomous 
with scorpioid branches ; fruit of 4, more or less free, nutlets :— 
dcliii— Heliotropium. 
LXXIX—CONVOLVULACEA. 
| Anatomical featwres.—The vascular bundles are bicollateral, and 
fibres have bordered. pits. The stem of the climbing species has a most varied 
anomalous structure. ‘heir roots abound in acrid milky juice, which is found often, 
but not copiously, in other parts, such as young fruits, leaves, etc. | 
the wood 
| Botanical note-—The following key, which splits up Argyreia, and Ipomaea into 
component genera, a8 now usually adopted, is taken from Sir D. Prain’s “ Bengal 
Plants.” | 
(1) Corolla tube usually uniformly enlarged from base to apex, the 5 bands 
on the lobes rarely clearly defined from the intervening spaces; pollen not 
spinescent :— 
(i) Yellow parasitic twiners without leaves; 
mouth scaly ; embryo spira! without cotyledous :— 
(ii) Non-parasitic, green leafy shrubs, usually twining :— 
(1) Fruit indehiscent, woody or fleshy, rather large; style short or none, 
stigma 4—10-rayed ; corolla lobes bifid, induplicate—contorted :— dcliv—Hrycibe. 
(2) Fruit dehiscent, or, if indehiscent, small with thin fragile walls :— 
(A) Flowers in racemes or panicles; corolla lobes induplicate— 
contorted :— 
(a) Ovary 1-locular, 2-ovuled ; capsule 1-seeded, indehiscent (rarely 
2-valved) ; sepals, outer 3or all, enlarged in fruit; style 
entire or shortly 2-lobed :-— ... ee cae dclxi—Porana. 
(b) Ovary imperfectly 2-locular, 4-ovuled; capsule 4-valved, 
1-seeded ; sepals not enlarged in fruit, but bract supporting 
fruit conspicuously enlarged; styles 2, distinct :—— 
delxii——Neuropeltis. 
(B) Flowers in cymes, or solitary ; capsule valvate or opercular (rarely 
dehiscing irregularly) :— 
(a) Styles 2,free or partly united below; sepals not (or slightly 
only) enlarged in fruit ; bracts small or wanting :-— 
(cx) Corolla lobes imbricate ; flowers axillary, solitary ; stamens 
exserted ; styles quite free, stigmas globose; capsule 1- 
locular, 4-valved, 1-seeded :— : ... dclxiv—Cressa. 
(8) Corolla lobes induplicate- contorted ; flowers subcapitately 
cymose; stamens not exserted ; styles usually partly united 
below, stigmas 2 capitate; capsule irregularly dehiscent, 
splitting into many vertical segments :— delxii-~ Bonamia 
(Breweria). 
lebes of corolla imbricate, 
dcelxy—Cuscuta. 
(b) Style entire, stigmas usually 2 :-- 
(x) Ovary l-locular; capsule 4-valved, 3-seeded ; stigmas short, 
oblong ; calyx lobes not enlarged ; bract not enveloping the 
calyx ; pollen polyhedral :— ... dcelx—Hewittia, 
(8) Ovary 2-(sometimes 4-)locular ; outer sepals (3) not larger 
than the 2 inner, nor decurrent on the peduncle :— 
(*) Stigmas elongated, elliptic; ovary 2-locular, 4-ovuled ; 
capsule &-(rarely 4-) valved ; hairs 3-to many-branched :— 
dclix—Jacquemontia, 
(* *) Stigmas globose :-- 
(7) Capsule 4-valved, ovary 2-(often 4+) locular, fruiting 
sepals not enlarged; bands of corolla usually with 5 
purple lines ; stems not winged :— .. delviii—Merremia 
(Ipomeea 2088, 2044, 2045, 2048). 
