176 KEY TO SUB-CLASSES, ORDERS AND GENERA. 
LXXXVI—LABIAT Ai —coné. 
(B) Corolla upper lip hooded, long, densely woolly; stamens not 
exserted :— 
(a) Calyx 8—10-toothea ; flowers white in axillary whorls :—— 
decxlix—~ Leucas. 
(b) Calyx 5-toothed; flowers yellow in dense flowered axillary 
x whorls :— tee So ae “00 ay decl-—Phlomis, 
(ii) Stamens 2 (with or without 1--2 staminodes), ascending or erect ; 
calyx 2-lipped :-- 
(1) Corolla subequally 4-lobed ; flowers white in terminal spikes of 
globose whorls :-- ss we see 240 58 con .» decxly—Meriandra. 
(2) Corolla bilabiate:-- 
(A) Flowers white or blue inshort axillary few flowered racemes ; 
leaves narrow linear :—- ... ae Ban ..  deexlvii-—-Rosmarinus. 
(B) Flowers white, blue, or purple, in dense flowered whorls forming 
racemes, or scarlet in 2-flowered whorls ; leaves broad :— 
deexlvi—Salvia. 
LXXXVII--NYCTAGINACEA— 
(1) Limb of perianth plicate :—- 
(i) Leaves opposite ; flowers small, pink or white, in umbels; stigma 
capitate ; twining shrubs :-- nis a eee nen ... decli-—Boerhaavia. 
(ii: Leaves alternate; flowersin threes, conspicuous chiefly from large 
coloured (magenta, rose, brick-red), bracts, to the midribsjof which the flowers are 
attached ; stigma lateral; large sarmentose or subscandent shrubs :— 
declii—Bougainvilla. 
(I1) Limb of perianth induplicate-valvate ; seeds with straight embryo and 
short radicle ; flowers small greenish-yellow in panicled cymes ; trees and thorny 
climbers:--- ... Nee 500 She 508 oes SBC Pe ... dechii--Pisonia, 
LXXXVIII--AMARANTACEAI— 
(I) Leaves all alternate ;'ovary 2-many-ovuled; fruit a berry ; flowers green- 
ish-white, minute, in spikes :— ies 500 Bee é decliv—Deeringia, 
(II) Leaves alternate , or alternate and opposite mixed ; ovary with l-ovule 
suspended from basal funicle; flowers perfect, minute in woolly spikes ; stamens 
with interposed staminodes :—— ay, ate me at deelvi~ Aerua. 
(IIL) Leaves all opposite; ovary with 1 ovule suspended from basal funicle ; 
flowers perfect, small, greenish or white in dense clusters ; stamens without inter- 
posed staminodes:— ... 26 S45 Bc ee Aid .. decly—Psilotrichum. 
LX XXIX—CHNNOPODIACEA— 
[Anatomical features.—Nearly all the plants of this order are “« Halophytes,” living 
near the seashore and inland in saline tracts. As far as is known, their roots largely 
take up salts of sodium, whilst most other trees and shrubs mainly take up potassium 
salts, though sodium salts are always present in the soil. Their ashes are rich in | 
sodinm chloride, and many species were formerly, and are still here and there 
employed to make an impure carbonate of soda (Barilla, Sajjz).] 
(I) Stems leafy, not jointed; leaves fleshy semiterete ; flowers minute, 
axillary, usually bisexual; stamens perigynous or subhypogynous ; seed with © 
es ... | declix—Sueeda. 
spiral embryo, albumen none or scanty:— _ ... wie t 
(II) Stems leafy, jointed ; leaves minute, thick or triquetrous; flowers small 
axillary ; stamens 5 or lesson an annular or cupular disk; seeds with spiral 
embryo, albumen O :— ... ee ae ack ee sae declx—Haloxylon. 
(IIT) Stems leafless, jointed ; flowers hermaphrodite :— 
(i) Flowers 2—6 together in the axils of the scales of a sessile cone-like 
spike; perianth ovoid or pyramidal, mouth narrowed, 3--4-fid ; seeds with horse- 
shoe-shaped embryo, albumen fleshy :— ... oe =p ...dcclvii—Arthrocnemum . 
(ii) Flowers 3-nate, sunk in superposed cavities of successive joints ; 
perianth obpyramidal, mouth wide, truncate or with 3—4 minute teeth ; seeds 
with conduplicate embryo, albumen O:— ees nor eve declviii—Salicornia. 
