Revision of Passiflora Subgenus Decaloba ... - Passion Flowers

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The Passiflora coriacea Complex
A principal components analysis (PCA) of the entire morphological data set
(Tab. 5.6) for the P. coriacea complex is presented in Fig. 5.4. Species that are
recognized in this revision as P. coriacea, P. megacoriacea, and P. sexocellata
are included and labeled accordingly. Principal components I, II, and III account
for 30.8%, 19.2%, and 10.5% of the variation, respectively, for a total of 60.5%.
Principal component axis I is most highly influenced by (presented in decreasing
order of component loadings) (Tab. 5.7): (1) degree that the leaf is peltate, (2)
stipe length, and (3) androgynophore length. Axis II is most highly influenced by
(1) degree that the leaf is peltate, (2) leaf width, and (3) length of the lateral leaf
lobe, and axis III by (1) pedicel length, (2) number of filaments in the inner
coronal row, and (3) length of the pubescence on the stem. The PCA plots of
axes I and II and I and III separate P. megacoriacea from P. coriacea and P.
sexocellata. The first principal component (PC1) and the third principal
component (PC3) consist of information from both floral and vegetative
characters. The second principal component (PC2) has low component loadings
for the floral characters and high component loadings for the vegetative
characters and is primarily an indicator of the degree that the leaf is peltate and
leaf size. The graphs in Fig. 5.4 place individuals with larger flowers that have
short floral stipes and long pedicels and larger leaves that are less peltate with
narrower lateral lobes in the right half of the scatter plots.
A PCA analysis of the data set for the P. coriacea complex based on floral
characters (Tab. 5.6) is presented in Fig. 5.5. Principal components I, II, and III
account for 41.5%, 16.6%, and 12.0% of the variation, respectively, for a total of