626 FABACEAE 



18. Lathyrus paucifldrus Fernald. Few-flowered or Brush Pea. Fig. 2953. 



Lathyrus pauciflorus Fernald, Bot. Gaz. 19: 335. 1894. 

 Lathyrus Bradfeldianus A. Nels. Bot. Gaz. 54: 411. 1912. 



Perennial, glabrous throughout, 6-9 dm. high, the stems angled, rather stout. Leaflets 6-12, 

 oblong-elliptic to oblong-lanceolate, acute, 2-4 cm. long, prominently veined ; stipules about half 

 as large as the adjacent leaflets, entire or dentate on the lower auricle; tendrils simple or 

 branched ; peduncles equaling or exceeding the leaves, 3-7-flowered ; calyx-teeth sparsely pubes- 

 cent, the lower about as long as the tube ; corolla 20-24 mm. long, violet ; pods narrow, 3-5 cm. 

 long, glabrous. 



Open woods, Humid and Arid Transition Zones; Vancouver Island to western Oregon, east to Idaho. Type 

 locality : Almota, Washington. April-June. 



Lathyrus pauciflorus subsp. utahensis (M. E. Jones) Piper, Proc. Biol. Soc. Wash. 31: 194. 1918. 

 Leaflets oval to ovate, obtuse. Eastern Washington and eastern Oregon to Colorado, Utah, and Arizona. 



Lathyrus pauciflorus subsp. tenuior Piper, Contr. U.S. Nat. Herb. 11: 378. 1906. Leaflets linear-lan- 

 ceolate, 3-6 cm. long; stipules nearly as wide as the leaves, but not half as long. Eastern Washington and Idaho. 



19. Lathyrus Schaffneri Rydb. Schaffner's Pea. Fig. 2954. 



Lathyrus parvifolius S. Wats. Proc. Amer. Acad. 17: 345. 1882. Not Roth. 



Lathyrus Schaffneri Rydb. Mem. N.Y. Bot. Gard. 1: 258. 1900. 



Lathyrus ecirrhosus Heller, Muhlenbergia 1 : 54. 1904. 



Lathyrus pauciflorus subsp. Schaffneri Piper, Proc. Biol. Soc. Wash. 31: 194. 1918. 



Perennial, glabrous, the stems rather stout, angled, erect or decumbent, 2-6 dm. long. Leaf- 

 lets 8-16, oval or elliptic, or sometimes narrowly elliptic, 1-3 cm. long, thick and prominently 

 nerved ; peduncles mostly exceeding the leaves, 6-12-flowered ; calyx-teeth glabrous or sparingly 

 pubescent on the margins, the lower shorter than the tube ; corolla about 12-15 mm. long, violet- 

 purple, or the wings and keel yellowish toward the base ; pod 25-35 mm. long, glabrous. 



Open coniferous forests, Arid Transition Zone; eastern Oregon south to the North Coast Ranges, the Sierra 

 Nevada and Tehachapi Mountains, California, east to Utah, and northern Mexico. Type locality: San Miguelito 

 Mountains, San Luis Potosi, Mexico. April-June. 



20. Lathyrus vestitus Nutt. Common Pacific Pea. Fig. 2955. 



Lathyrus vestitus Nutt. in Torr. & Gray, N. Amer. Fl. 1 : 276. 1838. 

 Lathyrus puberulus White ex Greene, Man. Bay. Reg. 85. 1894. 

 Lathyrus quercetorum Heller, Muhlenbergia 2: 290. 1907. 



Perennial, low and herbaceous or often 1-3 m. high, climbing over shrubs, woody at base, 

 more or less pubescent with somewhat appressed kinky hairs. Leaflets 8-14, ovate-oblong to 

 linear, cuspidate, rather firm, 15-30 mm. long, stipules semisagittate, less than half the size of 

 the leaflets, entire or few-toothed on the lower lobe; peduncles about equaling the leaves., 4-12- 

 flowered; calyx pubescent, the lower teeth lanceolate, equaling the tube; corolla 15 mm. long, 

 standard purple-veined, the petals otherwise white ; pod 4-6 cm. long, appressed-pubescent. 



Growing on open grassy slopes, or among shrubs, Upper Sonoran and Humid Transition Zones; western 

 Oregon to the Coast Ranges of central California. Type locality: "Plains of the Oregon [Columbia River] 

 toward the sea." Feb.-June. 



Lathyrus vestitus subsp. violaceus (Greene) Abrams. (Lathyrus violaceus Greene, Erythea 1: 105. 1893.) 

 Closely resembling the typical species in general habit, pubescence, and size and shape of petals and calyx-lobes, 

 distinguished only by the violet-purple standard petals. In recent California manuals it has been confused with 

 L. Alfeldii White (L. strictus Nutt.), but that has larger flowers, with very different shaped keel-petals and dif- 

 ferent calyx-lobes. California Coast Ranges from Monterey to Los Angeles County. Lathyrus violaceus var. 

 barbarae White is a narrow-leaved form of this subspecies. 



21. Lathyrus Bolanderi S. Wats. Bolander's Pea. Fig. 2956. 



Lathyrus Bolanderi S. Wats. Proc. Amer. Acad. 20: 363. 1885. 



Perennial, the stems stout, often with a narrow winged margin on the angles, 6-10 dm. high, 

 erect or climbing. Leaflets 8-12, ovate to ovate-lanceolate, 2-5 cm. long, prominently mucronu- 

 late, rather thin, paler beneath; tendrils slender, usually with several forks; stipules about half 

 the size of the leaflets, usually toothed below; peduncles as long as or sometimes well exceed- 

 ing the leaves, usually many-flowered ; calyx glabrous to rarely sparsely pubescent, the lowest lobe 

 usually exceeding the tube, lateral lobes lanceolate, about equaling the tube ; corolla purple or 

 nearly white and purple-veined, 15 mm. long; pods 4 cm. long, glabrous or sometimes with 

 minute brownish glands. 



Hillsides and open woods, mainly Humid Transition Zone; Coast Ranges of southern Oregon to central 

 California. Type locality: "Oakland Hills, Oakland, California." April-June. 



22. Lathyrus laetiflorus Greene. San Gabriel or Canyon Pea. Fig. 2957. 



Lathyrus laetiflorus Greene, Erythea 1: 105. 1893. 



Perennial, puberulent or rarely glabrous, the stems stout, climbing, 1-3 m. high, branching. 

 Leaflets 6-12, oblong to ovate, obtuse or acute, 1-5 cm. long, firm and coriaceous, veiny; tendrils 

 well developed, divided; stipules small, not half the size of the adjoining leaflet, commonly 

 toothed; peduncles stout, frequently twice the length of the leaves, 5-1 2- flowered ; calyx-teeth 

 very unequal, the upper triangular, the two lateral lanceolate-subulate, scarcely equaling the 



