BUCKWHEAT FAMILY 19 



5. Oxytheca caryophylloides Parry. Chickweed Oxytheca. Fig. 1345. 



Oxytheca caryophylloides Parry, Proc. Davenp. Acad. 3: 175. 1882. 

 Eriogonum caryophylloides Stokes, Gen. Eriog. 28. 1936. 



Stems solitary or 2 or 3 from the base, erect, tri- and dichotomously branched, 15-40 cm. 

 high, stipitate-glandular, the ultimate branches subcapillary. Leaves basal, spatulate-oblanceo- 

 late, 2-5 cm. long, sparsely pubescent at least on the midrib and margins; bracts 3-lobed, the 

 lower often foliaceous, 10-15 mm. long, the upper reduced and mucronate; involucres 5-parted 

 almost to the base, glabrous, the lobes narrowly oblong, 3 mm. long, tipped by an awn 1 mm. 

 long; flowers 2-3; calyx scarcely 1 mm. long, greenish, strigose, the lobes very short and entire. 



Sandy or gravelly soils, Arid Transition Zone; San Antonio, San Bernardino and San Jacinto Mountains, 

 southern California. Type locality: San Bernardino Mountains. July-Sept. 



6. Oxytheca trilobata A. Gray. Three-lobed Oxytheca. Fig. 1346. 



Oxytheca trilobata A. Gray, Proc. Amer. Acad. 12: 83. 1876. 

 Eriogonum trilobatum Stokes, Gen. Eriog. 27. 1936. 



Stems erect or the first internode very short and the branches widely spreading, usually 

 trichotomous at first node, and dichotomous above, 10-40 cm. high, minutely and sparingly 

 glandular. Leaves basal, spatulate-oblanceolate, rounded at apex, 1 . 5-3 cm. long, sparsely pubes- 

 cent on both surfaces; bracts deeply 3-lobed, the lobes lanceolate, 2-5 mm, long, awned with 

 a spine; involucres mostly on slender pedicel-like peduncles, broadly turbinate, deeply 5-lobed; 

 lobes lanceolate, 3 mm. long, tipped by a bristle awn of about equal length ; flowers short-pedi- 

 celled ; calyx white; lobes 2-cleft, erose on the sides, strigose. 



Dry slopes, Upper Sonoran and Arid Transition Zones; San Gabriel and San Bernardino Mountains, Cali- 

 fornia, to San Pedro Martir Mountains, Lower California. Type locality: San Bernardino County, California. 

 June-Aug. 



7. Oxytheca emarginata Hall. White-margined Oxytheca. Fig. 1347. 



Oxytheca emarginata Hall, Univ. Calif. Pub. Bot. 1 : 75. pi. 14. 1902. 

 Eriogonum emarginatum Stokes, Gen. Eriog. 27. 1936. 



Stems erect, branching from the first node, 5-15 cm. high, glandular-pubescent. Leaves 

 basal, spatulate, 1.5-2.5 cm. long, pubescent on both surfaces; bracts deeply 3-lobed, the lobes 

 lanceolate, spine-tipped, often recurved ; involucres conspicuous, green or usually reddish purple, 

 broadly funnel form, 4-6 mm. high, and as broad, shallowly and broadly 5-lobed, the lobes tipped 

 with slender spines and scarious-margined ; flowers 3-4 ; calyx 6-parted, the lobes fringed at 

 apex, pubescent. 



Gravelly ridges, Arid Transition and Upper Sonoran Zones; San Jacinto Mountains, southern California. 

 Type locality: gravelly ridges near Tauquitz Peak, San Jacinto Mountains, California. July-Aug. 



8. Oxytheca Parishii Parry. Parish's Oxytheca. Fig. 1348. 



Oxytheca Parishii Parry, Proc. Davenp. Acad. 3: 176. 1882. 

 Acanthoscyphus Parishii Small, Bull. Torrey Club 25: 53. 1898. 

 Acanthoscyphus Abramsii McGregor, Bull. Torrey Club 36: 605. 1909. 

 Eriogonum Abramsii Stokes, Gen. Eriog. 28. 1936. 



Stems erect, mostly solitary, tri- or dichotomously branched, the branches relatively few with 

 rather long internodes, 15-40 cm. high, stipitate-glandular toward the base of each internode, other- 

 wise glabrous and glaucous-green. Leaves basal, broadly spatulate, 2-3 cm. long, short-ciliate or 

 ciliate-denticulate on the margins; bracts small, 3-lobed, the lobes lanceolate-subulate ; involucres 

 terminating slender pedicel-like peduncles, broadly turbinate, the tube not lobed, 7-25-ribbed, each 

 rib terminating in a bristle-like spine 3-6 mm. long; flowers several, slender-pedicelled ; calyx 

 deeply 6-lobed ; lobes linear-oblong, entire, strigose on the back. 



Open pine forests, and dry slopes, Arid Transition Zone; Mount Pinos to the San Bernardino Mountains, 

 California. Type locality: San Bernardino Mountains. June-Sept. 



8. ERIOGONUM Michx. Fl. Bor. Amer. 1: 246. 1803. 



Annual or perennial herbs, or some species suffrutescent or shrubby. Leaves entire, 

 alternate, opposite or whorled, without stipules. Flowers perfect, involucrate. Involucres 

 campanulate to cylindric, 4—8-toothed or -lobed, awnless, several- to many-flowered ; pedi- 

 cels more or less exserted, intermixed with scarious setaceous bracts or bractlets. Calyx 

 6-parted or deeply 6-cleft, petaloid. Stamens 9, inserted at the base of the calyx. Styles 

 3-parted to the base; stigmas capitate. Achene triangular or rarely lenticular. [Name 

 Greek, meaning woolly and knee or joint, Michaux's species being hairy at the node.] 



A North American genus of about 150 species, most highly developed in the western United States. Type 

 species, Eriogonum tomentosum Michx. 



Calyx attenuated and stipe-like at base (see also 55, 56); bracts foliaceous, indefinite in number (2-5 or more). 



I. EUERIOGONUM. 



Calyx not stipe-like at base; bracts regularly ternate, not foliaceous. 

 Involucres solitary at the node; stems not articulate. 



Involucre campanulate or turbinate, not angled and very rarely obscurely nerved; teeth rounded, often 



membranously margined. II- Ganysma. 



Involucre cylindric-turbinate or prismatic, strongly 5-6-nerved, often becoming costate or angled; 

 teeth short, erect. HI. Oregonium. 



Involucres usually 3 at the node, one in the axil of each bract; stems articulate internally; perennial herb. 



IV. Clastomyelon. 



