KEY TO SUB-CLASSES, ORDERS AND GENERA. 179 
XCVII—PROTEACE 4%. 
[Anatomical featuwres.—Tho medullary rays as a rule are very broad and prominent, 
both on the transverse and radial section, the vessels are scattered in narrow bands of 
parenchymatic tissue which run at right angles to the rays alternating with bands 
of hard tissue consisting of wood fibres. | 
(1) Fruit an indehiscent nut ; flowers usually solitary within each bract, but 
forming dense cone-like spikes or heads within imbricate scale-like bracts and 
with outer bracts forming an involucre; anthers all perfect, inserted at thre 
base of the short spreading segments of the perianth ; stigma terminal, ovule 1 
(rarely 2) :-— 
(i) Perianth elongate, unequally 2-parted, broader segment with 3, narrower 
with 1, stamen :— Ses Ap Af ee ba ae dceelxxxvi—Protea, 
(ii) Perianth 4-cleft or parted ; stamen 1 on each segment :— 
declxxxvii— Leucadendron, 
(II) Fruit drupaceous with a thick, woody, indehiscent pericarp or putamen ; 
flowers in racemes, pedicellate in pairs; perianth regular or nearly so, small; 
anthers on short filaments attached below the segments of the perianth ; style 
cylindric or clavate at the end, ovules 2 :— 
(i) Leaves alternate ; ovules ascending :— me ... declxxxviii—Helicia, 
(ii) Leaves verticillate; ovules descending :— ... . declxxxix— Macadamia, 
(I11)—Fruit dehiscent, follicular or capsulir and 2— valved ; flowers in pairs 
with a single bract to each pair, rarely (in Stenocarpus) inflorescence anoma- 
lous :— 
(i)—Ovules 2, collateral ; seeds without intervening laminz or mealy sub- 
stance; flowers in racemes vr clusters with deciduous or akortive bracts or an 
involucre of imbricate bracts; perianth revolute in bud; leaves alternate :— 
(1) Seeds without wings, or the wings very short at both ends or annular 
inflorescence terminal (rarely also axillary) :— ie a decxc—Grevillea. 
(2) Seeds winged, chiefly or entirely at the upper end; inflorescence 
axillary:— ... ae te ae ae +: ... deexci—Hakea, © 
(ii) Ovules 2, collateral; seeds separated by a hard, usually woody, sub- 
stance, or by a membrane ; flowers in dense ovoid or cylindric cones without any 
involucre :— be a ee Loe Ae .. deexcv—Banksia. 
(iii) Ovules several, imbricate in 2 rows seeds ysually separated by thin 
laminzeor mealy substance :— 
(1) Flowers in short compact racemes, surrounded by an involucre of 
coloured bracts :— Si Bac ne ae to aie . dceexcii—Telopea. 
(2) Flowers in loose racemes, bracts small or deciduous :— 
decxiii—Embothrium; 
(3) Flowers in umbels without bracts:— ... . deexciv—Stenocarpus. 
XCVIJI—THYMELAMACE A, 
[Anatomical features.—Bast fibres areabundant in the bark, and the wood 
fibres have bordered pits. Aninterior phloem, often accompanied by thick walled 
bast fibres, is found on the outside of the pith. | 
(I) Leaves of perianth 4; stamens 8; leaves as a rule opposite; style shurt, 
stigma large giobose :— npc 360 ae deexcvi—Wikstroemia, 
(II) Leaves of perianth 5; leaves mostly opposite ; flowers in dense globose 
heads :— $ decxcvii— Lasidsiphon, 
XCIX—ELAAGNACEA, 
(I) Characters of the order (q.v. in the Synopsis) :—- .. decexcviii—Elxagnug. 
C—LORANTHACE. 
[ Anatomical featwres—The species here described are really half parasites, taking 
up carbon dioxide through their green leaves and branchlets, but relying upon the 
foster plant, on which they grow, for mineral and nitrogenous substances. When the 
seeds germinate on the bark of a tree, the roots penetrate through the bark into the 
wood. The roots of the parasites thus imbedded decay readily, and hence the wood of 
the foster tree becomes riddled and worthless. Some plants of Loranthus also send 
out aerial roots, which twist round the branches of the foster plant. | 
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