This fourth anthology of weird botanical and fungal entities collects 21 stories with menacing flowers, seeds from space, science experiments gone wrong, and expeditions running into mythical green monsters. Stories included are:
- Phalaenopsis Gloriosa (1905) by Edgar Wallace
- The Tree That Eats (1908) by Brew Molohan
- The Devil Plant (1923) by Lyle Wilson Holden
- Fungus Isle (1923) by Philip M. Fisher
- Mandrake (1923) by Adam Hull Shirk
- Si Urag of the Tail (1923) by Oscar Cook
- The Gray Death (1923) by Loual B. Sugarman
- The Man-Trap (1925) by Hamilton Craigie
- The Plant-Thing (1925) by R. G. Macready
- Dorner Cordaianthus (1925) by Hester Holland
- The Devil-Plant (1928) by John Murray Reynolds
- The Gas-Weed (1929) by Stanton A. Coblentz
- Up Irriwaddy Way (1929) by Lieutenant Edgar Gardiner
- Moss Island (1930) by Carl Jacobi
- The Giant Puffball (1931) by Eugene Stowell
- At the Bend of the Trail (1934) by Manly Wade Wellman
- Seeds from Space (1935) by Laurence Manning
- The Moaning Lily (1935) by Emma Vanne
- The Glowworm Flower (1936) by Stanton A. Coblentz
- Forest of Evil (1938) by John Murray Reynolds
- Seed (1946) by Jack Snow
