KEY TO SUB-CLASSES, ORDERS AND GENERA. 135 
XILTI—TAMARISCACEA— 
(I) Leaves scale-like ; flowers pink or white; petals and sepals 5; stamens 
5 or 10; styles 3; capoule 3-valved, seeds plumed:— ad .. Llxvi—Tamarix, 
XIV—HYPERICACE A— 
(I) Leaves opposite, gland dotted; flowers yellow; petals and sepals 5; 
stamens many, 3-or 5-adalphous ; capsule septicida] :— ... lxvii—Hypericom, 
XV—GUTTIFERA— 
[Anatomical features.—Resin canals and cavities in the leaves, pith,’and bark. 
Transverse bars of wood parenchyma between the medullary rays. | 
+» (1) Ovary 2—12-celled, stigma peltate, sessile or subsessile ;embryo a homo- 
genous fleshy mass :— ‘ 
(i) Calyx of 45 sepals ; ovary cells l-ovuled :— .. «+ Ixviii—Garcinia, 
(ii) Calyx closed in bud, bursting into 2 valves; ovary cells 2-ovuled :— 
lxix—Ochrocarpus, 
(Il) Ovary 1—2 celled, cells 1—4 ovuled, styles 1—2Z slender; embryo of 2 
fleshy cotyledons, sometimes consolidated :— 
(i) Secondary nerves many, close, conspicuous ; style 1, stigma peltate :— 
lxx—Calophyllum. 
(ii) Secondary nerves mfany, joined by transverse veins; styles 2, stigma 
minute :— y - aAe a Wf = ... lxxiii—Poeciloneuron, 
(iii) Secondary nerves many, close, but indistinct ; stigma peltate :—xxii--Mesna. 
(iv) Secondary nerves distant, inconspicuous; stigma 4-fid. :— lxxi—Kayea. 
XVI—TERNSTR@MIACE#.-— 
[Botanical note—SauRavsa is sometimes placed in DILLENIACEAE (q.v.).] 
(I) Peduncles 1-flowered; anthers basifixed; fruit a berry, embryo 
curved :— 
(i) Flowers bisexual; stamens many :— ie .. Ilxxiv—Ternstremia, 
(ii) Flowers dioecious ; stamens 15 or Jess :— or lxxy—Harya. 
(11) Peduncles 1-flowered; anthers versatile; fruit a dehiscent capsule, 
embryo straight :— 
(i) Seeds winged :— Basel ee pave ase “ -»» lxxvii—Gordonia. 
(i) Seeds wingless :— Ep os ie a ixxvili— Camellia. 
(111) Flowers in panicles or fascicled cymes; anthers veisatile; fruit 
baccate, embryo straight in copious albumen :— Ls .. Ixxvi—Sauranuja. 
XVII --ANCISTROCLADACEA— 
() Characters of the order (q.v., in the Synopsis):— ... lxxix— Ancistrocladus, 
XVilI—DIPTEROCARPACEA— 
[Anatomical features.— Resin ducts are found in the pith of the young stem and 
branches, in the pith of all vascular bundles, in the petiole. midrib, nerves and veins of 
leaves, as well as of those bundles which run through the bark. ‘he walls of these 
_ ducts are lined by a stratum of thin-walled secreting cells. In many species similar 
Gacts are also found in the woud. They contain an essential oil, known as Wood 
Oil in the case of Dipterocarpus. Exposed to the air, outside or in cavities of the trunk, 
these essential oils are transformed into resin. Cortical leaf traces—Some distance 
below the node the leaf traces separate from the central cylinder and run through the 
bark before they enter the petiole. There are generally three leaf traces, one apical, 
two lateral, all consisting of a vascular bundle with one or several resin dacts in the pith. 
in some cases these traces run in the bark through an entire internode. Structure of 
petiole—The three vascular bundles, which enter the petiole, forming its central 
cylinder, remain distinct in rare cases. Asa rule they ramify and coalesce forming at 
the base of the petiole an intricate mass of xylem and phloem witha number of 
resin ducts, and in most species the internal structure of the petiole changes in its 
progress from the base to the blade. For systematic purposes it is convenient to 
examine the petiole immediately below the base of the blade. At this point we 
frequently find a semi-circle of yascular bundles, more or less united, each with its 
resin duct, and inside this semicircle one or several vascular bundles with or without 
resin ducts. Structwre of wood——Vessels moderate sized, often in groups, enclosed ina 
narrow white ring consisting of wood parenchyma. Medullary rays fine and moderately 
. 
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