undated
15.88 x 20.32 cm (6 1/4 x 8 in.)
Graphite on paper
20th centuryGermanPurple crayon on paper
20th centuryGerman?Graphite on off-white wove paper
19th-20th centuryAmericanBlack ink, graphite, and yellow chalk on off-white wove paper
20th centuryAmericanColored marker, black pen, and opaque watercolor on paper
Graphite on paper
20th centuryGermanGraphite on off-white wove paper
19th centuryAmericanBlack, red, and white chalk on on off-white wove paper prepared with brown ground
19th centuryGermanOil paint on offset lithograph, 1989 edition of Flora de la Real Expedición Botánica del Nuevo Reino de Granada (1783-1810)
21st centuryPeruvianCharcoal on blue laid paper
19th-20th centuryAmericanGraphite on heavy cream wove paper
19th centuryBritishColored marker and black pen on paper
20th centuryGerman