Pisum

Garden pea Pisum sativum, copyright Rasbak.

Belongs within: Fabeae.

Pisum is a small genus of herbaceous legumes, native to the Mediterranean region. It is most notable for including the widely grown Pisum sativum, the garden pea.

Characters (from Flora of China): Herbs annual or perennial. Stem often climbing by means of tendrils, terete, glabrous. Leaves paripinnate with rachis termi­nating in a tendril; stipules leaflike, cordate, larger than leaflets (to 10 cm); leaflets 1-3-paired, ovate to elliptic, margin entire or den­tate. Inflorescence a 1- to many-flowered raceme. Calyx campanulate; teeth more or less leaf-like, at least 2 teeth less than twice as long as tube. Corolla white or otherwise colored; standard obovate. Stamens diadelphous; staminal tube not oblique at apex; filaments distally slightly dilated. Ovary subsessile; ovules many; style curved inward, distally dilated and margin recurved forming a laterally com­pressed body, longitudinally grooved, hairy on upper side. Legume long elliptic, inflated, apex acute. Seeds many, spheroid.

<==Pisum
    |--P. arvense D37
    |--P. fulvum LR-S01
    |--P. humile D37
    `--P. sativum LR-S01
         |--P. s. ssp. sativum LR-S01
         |--P. s. ssp. abyssinicum LR-S01
         |--P. s. ssp. elatius LR-S01
         |--P. s. ssp. jomardii LR-S01
         |--P. s. ssp. nepalensis LR-S01
         |--P. s. ssp. syriacum LR-S01
         |--P. s. ssp. thebicum LR-S01
         `--P. s. ssp. transcaucasicum LR-S01

*Type species of generic name indicated

REFERENCES

[D37] Dobzhansky, T. 1937. Genetics and the Origin of Species. Columbia University Press: New York.

[LR-S01] Liu, A., & T. J. Ridsdill-Smith. 2001. Comparison of feeding damage by redlegged earth mite Halotydeus destructor (Tucker) (Acari: Penthaleidae) to different grain legume species as an indicator of potentially resistant lines. In: Halliday, R. B., D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff (eds) Acarology: Proceedings of the 10^th International Congress pp. 295–299. CSIRO Publishing: Melbourne.