OLITEE ON THE STEM OF DICOTYLEDONS. 321 



arvense, M. cristatum, M. prateiise, Tozzia alpina. A true fibro- 

 cortical system is generally absent in tlie Rhrnantlieae. In 

 several genera tlie medullary sheatli becomes confounded or con- 

 fused witb the ligneous zone, wliicb is destitute of medullary 

 rays, excepting in the rhizomes of some species of Fedicularis. 

 General observations on the anatomy oi Bhinantlieae {vide p. 209). 

 — Pitra, A. iiber d. Anheftungsweise einiger phanerog. Parasiten, 

 Bot. Zeit. 1861, 65, with figures. — Orobancheae. Unger. Frz. 

 Beitrage z. Kenntniss d. Parasit. Pflanzen, 1811, tab. iii. — 

 Duchartre, Ann. Sc. Nat. Ser. iii. 47-1. Compt. Eend. 1844, i, 

 93. — Lory, Ch. Observations sur la Eespiration et la Structure des 

 Orobanches, &c. Ann. Sc. Nat. Ser. iii. viii, 15, 165. Present a 

 central pith passing insensibly into the ligneous zone ; medullary 

 sheath and rays are absent. The narrow wood-zone is made up 

 of triangular fascicles of elongated, thick- walled cells, surrotmd- 

 ing annular and unreliable spiral vessels. — Henfrey, A. On 

 the Structure and Habits of the Orobanchaceae. Ann. Nat. 

 Hist. Ser. ii. iii. 29. — Chatin. A. Compt. Eend. 1856, tab. 

 xlii. 792. — Anatomie Comp. des Vegetaux, Livr. iii. 44, with 

 plates. The stem-structure is described in Orobanclie crue^ita, O. 

 JSpithymum, O. Galii, O. pruinosa, O. Teucrii, O. ainethystea. — 

 Phelipeae, p. 66, P. ramosa, P. indica, P. arenaria, P. coerulea. — 

 Epipliegus, p. 78, E. Virginianus. — Conopliolis, p. 81, C. ameri- 

 cana. — AnoplanthicSy p. 84, A. uniflorus, A. comosus, A. Bieber- 

 steinii. — Clandestina, p. 89, C. rectiflora. — Lathrcea, p. 95, L, 

 Squamaria. — Poschniakia, p. 99, P. glabra. — Aeginetia, p. 103, 

 jE. indica. — Hyobanclie, p. 105, H. sanguinea. General observa- 

 tions on the Anatomy of Orobanchaceae, p. 108. In Orobanche 

 the vascular bundles form a series of bundles in the midst of a 

 continuous layer of woody fibres ; in Philipcea the slender 

 woody fibres are exterior to the vascular bundles of the stem. 

 Conopholis and Epiphegus have their fibro-vascular bundles 

 isolated by medullary plates. Spiral vessels are absent in the 

 vegetative organs of Gtandestina and Lathrcea ; the number and 

 form, in section, of the vascular biuidles differ in these genera. 

 In PoschniaJcia the fibro-vascular system is traversed by medul- 

 lary rays. Aeginetia and Hyobanclie have the fibro-vascular 

 bundles isolated by parenchyma ; these genera differ from true 

 Orobancheae in the form and arrangement of their fascicles in 

 the rhizome. — Latliraea Squamaria. Bowman, J. E. On the 

 Parasitical Connection of, &c. Limi. Trans, xvi. 399. — Ducharti'e, 

 M. Anatomical and Organogenical Researches on L. Clandestina. 

 Ann. Nat. Hist. 1845, xv. 410. Eemarking the absence of 

 medullary sheath, of spiral vessels, and of medullary rays. The 

 arrangement of the vessels (reticvilated or dotted) in the wood- 

 zone is described. — also Observations sur la, in Mem. Sav.Etraug. 

 X. 1847, with plates. A detailed account of the anatomy. — Chatin, 

 A., Anatomie du L. Squamaria comparee a celle du Clandestina 



