Descriptors |
Characteristics |
|
Tubers |
Tuber development distance from the center of the pit |
Very distant, >1.2 m; distant, 0.7-1.2 m; close, 0.3-0.7 m; very close, <0.3 m. |
Presence of roots |
Absent; scarce; dense. |
Location of the roots |
All over the tuber uniformly; concentrated in the apical part. |
Roughness of the skin |
Smooth almost wrinkle free; medium roughness; deep wrinkles; two types of wrinkles (linear wrinkles in the apical part, and poly-angular wrinkles in the distal part |
Color of the skin |
Brown; dark brown. |
Thickness of the skin |
Very thin, < 0.5mm; thin> 0.5mm. |
Color of the buds |
Green; yellowish-green; light purple; dark purple. |
Capacity of budding |
Easy; difficult (up to one month later). |
Tendency to branch |
Absent; slight; moderate. |
Tuber shape |
Round; oval and less oblong; oval; oval and very oblong; cylindrical; triangular, distal part wider; curved; apical part thin and long; wider than long; flat and irregular. |
Color of the tuber flesh |
White; yellowish-white; light purple; dark purple; white with a thin purple layer (≤ 1mm) of the outermost cortex; white with purple spots; white with a purple outer layer of 0.5-1 cm and a purple apical part; purple with light spots; purple with a white layer of 1-2 cm in the distal part. |
Uniformity of tuber flesh color |
Uniform; polycolored. |
Brownish oxidation of the tuber flesh after cutting |
Non browning; intensive browning; browning only in the exterior part or in some spots. |
|
Stems |
Color of young stem > 30 cm |
Green; green with little purple pigmentation (PP). |
Color of young stem wings >30 cm |
Green; green with little PP; green with much PP. |
Presence of wings on the young stem |
Present; absent. |
Color of mature stem (1 m height) |
Green; brownish-green; green with little PP; green with much PP. |
Color of mature stem wings (1 m height) |
Green; green with little PP; green with much PP. |
Color of mature stem (15 cm height) |
Green; brownish-green; green with little PP; green with much PP; dark purple. |
Color of mature stem wings (15 cm height) |
Green; green with little PP; green with much PP. |
Growing habit of the stem |
Straight; slightly zigzag. |
Many lateral branches |
Present; absent. |
Number of internodes until fully opened first leaves |
Five to nine; more than nine. |
Average diameter of the mature stem |
Obtained by measuring the diameter of stem, at 15 cm height from the base of the plant, five measurements per plant, two plants per plot in each block. |
Average length of the internodes |
Obtained by measuring the distance between leaf scars, at 1 m height from the base of plant, five measurements per plant, two plants per plot in each block. |
|
Leaves |
Color of the mature leaf |
Light green; green; dark green. |
Color of the petiole of the young leaf |
Green; green with slight PP at the base and junction with the leaf blade; Green with intensive PP at the base and junction with the leaf blade; all petiole with PP more intense at the base and junction with the leaf blade; brown; dark purple. |
Presence of wings on the petiole |
Present; absent. |
Color of the young petiole wings |
Light green; green with little PP; green with many PP. |
Color of the petiole of the mature leaf |
Green; reen with little PP; green with much PP; green with PP at the base and junction with the leaf blade; all petiole with PP, more intense at the base and junction with the leaf blade; reddish-brown; dark purple; base remains green, but other parts with PP. |
Color of the mature petiole wings |
Green; green with little PP; green with much PP. |
Density the foliage |
Low; intermediate; high. |
Number of lobes |
Predominantly 3; predominantly 5. |
Deepness of the lobes |
Less deep; very deep; very deep and less deep (two types) |
Distance between the two upper lobes and the petiole |
No distance; little distance; intermediate; very distant |
Size of the main lobe |
Particularly large (more than twice the size of other lobes); regular (same or slightly larger). |
Average diameter of the leaf |
Obtained by measuring the maximum diameter of the leaf area, five measurements of mature leaves per plant, two plants per plot in each block. |
Average length of leaves |
Obtained by measuring the maximum length of the leaf area, five measurements of mature leaves per plant, two plants per plot in each block. |
Average length of petioles |
Obtained by measuring the length of five petioles of mature leaves, two plants per plot in each block. |
|
Flowers and fruit |
Months until flowering after budding |
Before four months; between four and five months; between six and seven months; without flowering. |
Sex |
Female; male. |
Number of male inflorescences |
Few (50-100); medium (100-200); many (>200). |
Spikes often with double flowers |
Present; absent. |
Spikes with lateral branches |
Present; absent. |
Single or double flowers in the leaf axils without spikes |
Present; absent. |
Number of female inflorescences |
Few (1-30); medium (30-60); many (60-100). |
Shape of fruit |
Very oblong; less oblong, almost round. |
Average number of flowers per inflorescence |
Obtained by counting the flowers of five inflorescences, two plants per plot in each block. |