Pharmaceutical botany - Lighthouse Survival Blog
Pharmaceutical botany - Lighthouse Survival Blog
Pharmaceutical botany - Lighthouse Survival Blog
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lO PHARMACEUTICAL BOTANY<br />
Fig. 6.—Closed bundle of stem of Zea mays. VG, Bundle sheath; L, intercellular<br />
space; A, ring from an annular tracheal tube; SP, spiral tracheal tube;<br />
M, pitted vessels; V, sieve tubes; S, companion cells; CP, crushed primary sieve<br />
tubes; F, thjn-walled parenchyma of the ground or fundamental tissue. {From<br />
Sayre after Strasburger.)<br />
Fig. 7.—Transverse section of a concentric bundle from the rhizome of Iris<br />
Xylem surrounding the phloem. I, Tracheae; t\ protoxylem; s, sieve tubes; gg-<br />
companion cells of the internal phloem portion. {From Sayre after Vines.)