Genetical Studies on Otnothera. V. 



175 



Mature plants. About 1 m. liigh. Central 

 shoot surrounded by numerous long side 

 branches from the rosette, almost equal 

 to the central shoot in length and vigor, 

 tips of branches straight (Fig. 6) 



Foliage. Leaves broadly-elliptical, ob- 

 scurely serrate, almost plane (Figs, (i, 8). 

 Color grass-gi-een. 



Inflorescence. Bracts '/^ — Yj length of ma- 

 ture buds, relatively broad (Figs. 8, IG). 

 Younger buds projecting beyond the 

 bracts (Fig. 8). 



Mature buds. 5"5 — 6 cm. long. Cone 

 2 — 2'.3 cm. long, less strongly 4-angled. 

 Sepal tips long and slender (Fig. 16). 

 Pubescence of sepals and ovaries pilose 

 and puberulent. 



Petals. 2 — 2'3 cm. long, a darker yellow. 



Stigma lobes. 4 — 5 mm. long, more slender, 

 generally about 3 mm. below the tips of 

 the anthers. 



Capsules. 2 — 2'3 cm. long. A large yield 

 of seeds. 



Mature plants. About r3 m. high. Central 

 shoot surrounded by a smaller number of 

 side branches from the rosette, much 

 shorter and less vigorous than the central 

 shoot, tips of branches nutant (Fig. 7). 



Foliage. Leaves narrowly-elliptical, irre- 

 gularly toothed, revolute or keeled (Figs. 

 7, 0). Color blue-green. 



Inflorescence. Bracts '/» — Vs length of 

 mature buds, relatively narrow (Figs. 9, 

 1 6). Bracts projecting beyond the younger 

 buds (Fig. 9). 



Mature buds. 4'5 — 55 cm. long. Cone 

 ri — 1"3 cm. long, more strongly 4-angied. 

 Sepal tips shorter and thicker (Fig. 16). 

 Pubescence of sepals and ovaries more 

 pilose. 



Petals. 1 — 1'.3 cm. long, a lighter yellow. 



Stigma lobes. 2 — 3 mm. long, thick, gene- 

 rally 1 — 2 mm. above the tips of the 

 anthers. 



Capsules. 2'5 — 3 cm. long. A large yield 

 of seeds. 



The reciprocal crosses between biennis and muricata were made in 

 1912 and the cultures grown in the following year. The capsules on 

 the mother plants following the crosses were large and ^yielded a liberal 

 supply of seeds. The seeds of biennis X muricata gave, however, a 

 small percentage of germinations after being 6 weeks in the seed pans, 

 it being necessary to sow the contents of 5 capsules, 675 seeds, to 

 obtain 139 plants. Of these 92 plants were brought to maturity^) 

 constituting culture 13-33, biennis X muricata. The seed of muricata X 

 biennis germinated readily and the contents of 3 capsules, 153 seeds, 

 gave 107 plants of which 78 were brought to maturity ^) constituting 

 culture 13"34, muricata X biennis. Each culture was perfectly uniform in 

 its characters except that in 13'34 a single dwarfish plant appeared which 

 was completely sterile when selfed. The characters of these reciprocal 

 crosses will be given in parallel columns that their points of resemblance 

 to the parents and of sharp conti-ast to one another may more readily 

 be noted. The cultures were grown side by side with the parent stock 

 in the experimental garden. 



') The remaining plants furnished herbarium material of stages in the develop- 

 ment of the seedlings and rosettes. 



