Comprehensive Description
(
英語
)
由Smithsonian Contributions to Botany提供
Vellozia tragacantha Martius ex Seubert
SPECIMENS EXAMINED.—H. S. Irwin 2495; Claus-sen 13, 1794.
SURFACE VIEW.—Hairs: few present in small tufts. Epidermis: cells mostly square to rectangular on both surfaces, few rounded, thin walled. Stomata: paracytic, 15 × 9 μm; present on abaxial and adaxial surfaces.
TRANSVERSE SECTION OF LAMINA.—Dorsiventral; V-shaped with small median adaxial groove. Adaxial and abaxial surfaces only very slightly undulating. Epidermis: adaxial cells rounded to dome shaped, few conical; cells larger in median adaxial groove. Abaxial cells rounded to dome shaped. Cuticle: thin and slightly ridged on adaxial surface; thick and slightly ridged on abaxial surface. Stomata: present on abaxial and adaxial surfaces; substomatal chamber present; distinctly sunken. Mesophyll: four to five layers of palisade cells grading into compactly arranged spongy tissue. Two layers of large translucent tissue arranged radially above midvein and some vascular bundles. Vascular bundles: 8; no commissural bundles observed. One to two large vessels present in each vascular bundle. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. Adaxial cap present on each vascular bundle, sometimes as large as abaxial girder. Bundle sheath completely surrounding each vascular bundle. Crystals and tannins: none observed.
- 書目引用
- Ayensu, Edward S. 1974. "Leaf Anatomy and Systematics of New World Velloziaceae." Smithsonian Contributions to Botany. 1-125. https://doi.org/10.5479/si.0081024X.15
Vellozia tragacantha: Brief Summary
(
越南語
)
由wikipedia VI提供
Vellozia tragacantha là một loài thực vật có hoa trong họ Velloziaceae. Loài này được (Mart. ex Schult. & Schult.f.) Mart. ex Seub. miêu tả khoa học đầu tiên năm 1847.
Bài viết liên quan đến Bộ Dứa dại này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn. 
