甘肃天门冬 gan su tian men dong

Subshrubs dioecious. Roots with subterminal tuber 2--3 cm thick. Stems erect, much branched, 17--27 cm, densely noded; stem and branches striate-ridged, ridges cartilaginous denticulate. Cladodes in fascicles of (3--)5--10, needlelike, 5--8 × ca. 0.4 mm, irregularly grooved. Leaf spur spinescent; spine spreading horizontally, straight, 2--5 mm on main stems, slightly shorter toward base of plant, slender, sharp. Inflorescences developing after cladodes. Flowers of both sexes solitary or paired; pedicel ca. 1 mm. Male flowers: perianth campanulate, 2--2.5 mm; filaments adnate to perianth segments for ca. 1/4 their length. Fl. Jun.

* Slopes; 900--1600 m. S Gansu.

The tuberous roots are edible.